Fix Neutron controller setup for RHEL/CentOS/Fedora

Add package installation and service management steps for Neutron setup
on a RHEL/CentOS/Fedora controller.

Change-Id: I1b4eda21d1ff56869418e2a9c1f6515a0eec9969
backport: havana
Merge "Fix Neutron controller setup for RHEL/CentOS/Fedora"