Convert Neutron to thin containers

*** Requires Docker 1.10 which is released ***

Documentation will be in the next patch. You must set the following
in your docker.service daemon control file for propogation to work:

    [Service]
    MountFlags=shared

======================================================================

Thanks to mount propagation in Docker 1.10 we can use thin containers
finally! This is extremely useful to operators since now they can
access the network namespaces from the hosts (outside the neutron
container). But additionally it allows us to implement the VPN agent
and other services easier.

Neutron containers and the neutron role are brought into the standards
of the new Kolla. Completely with drop-root and ansible formating
updates.

The ip_wrapper.py script was (thankfully) not needed so it has been
removed from the repo.

Partially-Implements: blueprint upgrade-neutron
Change-Id: Iaf5555283240457e1912459f397a6393d886fba1