Implement new Liberty default for Neutron rpc_workers
Implement new Liberty default for Neutron rpc_workers

The default number of Neutron rpc_workers has changed in Liberty from 0
to 1. This patches changes the default to this value, as the default of 0
results in a very high number of workers.

Implements: blueprint gate-split
Implements: blueprint liberty-release
Change-Id: I31ebbbbb10e260b2895aa5d55d3716136dbffd90
michaelgugino/openstack-ansible-os_neutron,michaelgugino/openstack-ansible-os_neutron