ovsdb has a nice json rpc interface, it's pretty nice to dump structured data.
Unfortunately, tools like appctl don't support json. The goal of this project is to implement this.

Currently I just have a poc. 

Using the unixctl python module we already have in ovs I connect to the vswitchd unix socket, and send `vlog/list` command.
Here is the output :

    ```
    {
  "ofproto_dpif_mirror"
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofp_errors": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "in_band": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "command_line": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "cfm": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "poll_loop": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "util": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "connmgr": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "unixctl": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofproto_dpif": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "stream_fd": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netdev_vport": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "bundle": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "backtrace": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "lacp": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "bundles": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "svec": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ovsdb_idl": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "stp": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "pktbuf": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ovsdb_error": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "classifier": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "bfd": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "bridge": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netdev_dummy": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "nx_match": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "rconn": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofproto_dpif_monitor
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "vconn": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "process": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "lockfile": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "sflow": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofproto": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "meta_flow": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netdev": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "vlog": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "route_table": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "system_stats": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "multipath": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "timeval": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netflow": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netlink_notifier": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "jsonrpc": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netlink_socket": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofp_util": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "reconnect": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "entropy": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ipfix": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofp_actions": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "xenserver": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ovs_rcu": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "vswitchd": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofproto_dpif_upcall"
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "hmap": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "fatal_signal": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "dpif_linux": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netlink": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "socket_util_unix": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "dpif_netdev": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ovs_thread": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "signals": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "coverage": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofp_msgs": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "vlandev": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "daemon_unix": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "socket_util": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "tunnel": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "daemon": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "collectors": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "vconn_stream": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "stream_ssl": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "stream_unix": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "bond": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "memory": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "stream": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "stream_tcp": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "fail_open": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "ofproto_dpif_xlate":
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "pcap": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "netdev_linux": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "dpif": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"},
  "odp_util": {
    "level": "INFO",
    "console": "OFF",
    "syslog": "INFO"}}
    ```