Remove use_neutron from sahara config
Remove use_neutron from sahara config

Nova network has been fully removed from the OpenStack codebase.
As such, all instances of switches on use_neutron should be removed,
as the functionality will never be meaningful.

Change-Id: I6af9af897b5a4416082307e01dca951c9b7026ad
Depends-On: Ib9d87dd339d637b69fb27315d92228cbc523c8eb

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible