Dont try to disconnect when not connected
Dont try to disconnect when not connected

When multiple leader updates would come, it would trigger multiple
Disconnects and log messages. There's no reason to do it if we already
disconnected.

Signed-off-by: Tim Rozet <fa77065b01316237fb8724959b2d0a325cd92ce5@redhat.com>

socketplane/libovsdb