Add suport to neutron-agents and ovs runs in storage node

The generic driver for manila need the neutron agents
and OVS / Linuxbridge running on the same node as manila_share.
This is necessary when the DHSS (Driver Handles Share Servers)
is the value "True", so that the manila_share can talk
with NFS manager.

Change-Id: I21904659b1789fa71118401bfb6ac2227ae564da
Partially-Implements: blueprint enable-manila-containers