lxc/networks: Validate config in doNetworksCreate
lxc/networks: Validate config in doNetworksCreate

This ensures config is validated on each cluster node after local node fields have been applied.

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

hallyn/lxd,atxwebs/lxd,stgraber/lxd,stgraber/lxd,atxwebs/lxd,Skarlso/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,Skarlso/lxd,Skarlso/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,mjeanson/lxd,atxwebs/lxd,hallyn/lxd,Skarlso/lxd,mjeanson/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,mjeanson/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd,hallyn/lxd,hallyn/lxd,stgraber/lxd