Adds Neutron Server Support

Previously Kolla did not support Neutron. This patch provides
initial Neutron support by implementing neutron-server
functionality. It also creates a neutron-base image that
provides common config and packages for all Neutron-based
services.

Partially Implements: Blueprint Kubernetes Neutron Container

Change-Id: I2399a1331992fae0f387f01e5b5c1c1d34f0637d