lxd/network/driver/ovn: Adds parseRouterIntPortIPv4Net and parseRouterIntPortIPv6Net functions
lxd/network/driver/ovn: Adds parseRouterIntPortIPv4Net and parseRouterIntPortIPv6Net functions

And uses them to avoid duplication of empty/none IP setting check.

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

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