lxd/network/driver/ovn: Changes uplink network in use check to look at LXD DB
lxd/network/driver/ovn: Changes uplink network in use check to look at LXD DB

Rather than using the presence of a patch port connected to the local uplink OVS bridge, as this is not always reliable (it can take time to be released).

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

lxc/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,atxwebs/lxd,lxc/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd,hallyn/lxd