lxd/network/driver/ovn: Moves parent port lock into startParentPort
lxd/network/driver/ovn: Moves parent port lock into startParentPort

So it applies to all uplink parent network types.

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

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