datapath: backport: openvswitch: use alias for genetlink family names

Upstream commit:
    commit ed227099dac95128e2aecd62af51bb9d922e5977
    Author: Thadeu Lima de Souza Cascardo <[email protected]>
    Date:   Fri Sep 9 17:42:30 2016 -0300

    openvswitch: use alias for genetlink family names

    When userspace tries to create datapaths and the module is not loaded,
    it will simply fail. With this patch, the module will be automatically
    loaded.

    Signed-off-by: Thadeu Lima de Souza Cascardo <[email protected]>
    Acked-by: Pravin B Shelar <[email protected]>
    Signed-off-by: David S. Miller <[email protected]>

Signed-off-by: Thadeu Lima de Souza Cascardo <[email protected]>
Signed-off-by: Jesse Gross <[email protected]>

datapath/datapath.c

@@ -2458,3 +2458,7 @@ module_exit(dp_cleanup);
 MODULE_DESCRIPTION("Open vSwitch switching datapath");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(VERSION);
+MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
+MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);