Add support to linuxbridge manifests for Red Hat distros

This mirrors the change that was done for the OVS plugin/agent.
In addition, defaults for sql_connection and network_vlan_ranges
that mirror the ones for the OVS plugin were added.

Change-Id: I56c6373215bb3940c870f5921c70b197b4fe74f1
Merge "Add support to linuxbridge manifests for Red Hat distros"