lxd/network/openvswitch/ovn: Pass --wait=sb when using ovn-nbctl
lxd/network/openvswitch/ovn: Pass --wait=sb when using ovn-nbctl

This ensures the command doesn't return until changes are in the OVN southbound database.

This seems to help with reliability of OVN on Ubuntu Jammy.

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

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