lxd/network/driver/ovn: Adds ovn.name setting to store OVN logical network name
lxd/network/driver/ovn: Adds ovn.name setting to store OVN logical network name

 - Stored at network setup time so that if a cluster node is joined in the future it can access the correct OVN network name in the pre-join phase before the database IDs are synced.
 - Moves ovnParentOVSBridge config populated into setupParentPort as is not parent network type specific.
 - Wraps setupParentPort and the population of ovn.name in a single transaction so it is done atomically.

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

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