Skip provider_networks module if possible
Skip provider_networks module if possible

If the deployer is setting its own neutron_provider_networks, there
is no need to force running the provider_networks module. We can
pass the variables directly to neutron, like we do in the role
testing.

Change-Id: I31ec312f7f023e7bc8e96072ebe55915e8970aef

stackforge/os-ansible-deployment,openstack/openstack-ansible,stackforge/os-ansible-deployment,openstack/openstack-ansible