ovn-sbctl: enable listing dhcp options tables

Enable operations (including "list") on DHCP_Options and DHCPv6_Options
tables via ovn-sbctl. These are currently the only OVN_Southbound
tables that ovn-sbctl does not support.

Example:
    $ ovn-sbctl -f table list DHCPv6_Options
    _uuid                                code name          type
    ------------------------------------ ---- ------------- ------
    8646bb15-5e88-4432-a21a-4e22a2976482 23   dns_server    "ipv6"
    564e98e9-ee23-447b-a7c5-c36ca05059fa 24   domain_search str
    8c6cb059-5bb5-4ef8-960b-f002c769589e 2    server_id     mac
    525e8fc6-7921-48eb-8bd3-fe5cb5dd0142 5    ia_addr       "ipv6"

Signed-off-by: Lance Richardson <[email protected]>
Signed-off-by: Ben Pfaff <[email protected]>

ovn/utilities/ovn-sbctl.c

@@ -1074,6 +1074,14 @@ static const struct ctl_table_class tables[] = {
      {{&sbrec_table_address_set, &sbrec_address_set_col_name, NULL},
       {NULL, NULL, NULL}}},
 
+    {&sbrec_table_dhcp_options,
+     {{&sbrec_table_dhcp_options, NULL, NULL},
+      {NULL, NULL, NULL}}},
+
+    {&sbrec_table_dhcpv6_options,
+     {{&sbrec_table_dhcpv6_options, NULL, NULL},
+      {NULL, NULL, NULL}}},
+
     {&sbrec_table_connection,
      {{&sbrec_table_connection, NULL, NULL},
       {NULL, NULL, NULL}}},