Disable in-band control for PUBLIC_BRIDGE

By default, Open vSwitch installs internal flows for in-band control
to bridges with controller setting.  "with controller setting" part
is false for openvswitch agent but can be true for ofagent.
Unfortunately the internal flows are incompatible with our use of
the local port here to communicate with neutron router.  This commit
avoids the problem by disabling the in-band control functionality.

Related to blueprint ofagent-port-monitor
Change-Id: Ia79d12da3c2224366425be5f6927859181e18909
Allow to use flat providernet for public network

The support of ancillary bridges (aka br-ex) is planned to be
dropped for ofagent.  This commit prepares the deprecation by
providing devstack support for an alternative way to connect
public network.

Related to blueprint ofagent-port-monitor
Change-Id: I6c2ce646070db0ed248665216071499a9b5567ab
Exact match rhel6

With rhel6 & rhel7 having a common prefix, use an exact match to make
sure we don't mix them up.  This is breaking Centos7.

Change-Id: Ia4665ea78f0bafeaa2b2284a6d3de4474ea195e9
Cleanup lib/ironic

This moves around a bunch of functionality and attempts to isolate setup
steps into discrete functions (new or existing), making them easier to
consume from outside of Devstack (ie, Grenade).

Change-Id: I480167dcc008506ec2fe8c412db4114b74496e60
Add MAINTAINERS.rst

Add a MAINTAINERS.rst file with two goals

1) to help seed initial reviews with relevant people.  Devstack by its
nature attracts new contributors, so when they hit some obscure bug,
this will help them find out who to put on a review.

2) core reviewers can't know everything about everything.  Having
someone who has flagged themselves as interested in an area sign-off
off on relevant changes can help move changes through.

Change-Id: Idf0914f55d72832a829ac99edf763ff51f71ca6c
Change ordering of ceilometer service startup

If the compute-agent starts before the collector directly
after a start or restart of the AMQP service, samples published from
the compute-agent can be lost before the collector has had a chance
to establish connections. These lost samples impact the reliability
of tests which run immediately after the service [re]start.

Note: if there is a restart of the ceilo service, but not the AMQP
service, the problem does not present itself becaue the messaging
service maintains some state on the exchanges it keeps.

Change-Id: I1c06d0511fbf93050cda56d9d2de0ff00813dfb6
Closes-bug: 1355809
Merge "Disable in-band control for PUBLIC_BRIDGE"
Merge "Add MAINTAINERS.rst"
Merge "Cleanup lib/ironic"
Merge "Allow to use flat providernet for public network"
Merge "Exact match rhel6"
Merge branch 'master' of https://github.com/openstack-dev/devstack