Glance: bring Swift backend support

This patch adds the Swift backend support in Glance service.

* Add the backend in cloud::image::api without new parameter.
* Add new unit tests to validate the backend support with a new context.
* Document the new backend in README.

Change-Id: I685978161e51baa47c897fe0824401615e8c4387
(cherry picked from commit 0035caea35a1fa0427be549ac12f6e989dd4fa36)
Add Dell EQLX Cinder Backend

Add the support for EQLX Cinder Backend in the multi-volume
configuration.

Change-Id: Id0bae8d8f8c5d7fbaaa62f881f5bd6316f2a6314
(cherry picked from commit 1564358faac6994e28545b40a5a2b49ba055094b)
Refactorize Neutron configuration

* Drop plugin config in cloud::network because it's only needed in
 cloud::network::controller
* Drop deprecated parameters

Change-Id: I284402d5135cff61a565b7d33522c622dc8e4c06
(cherry picked from commit 6e4f4071aa024878003c938fdda2f8dadb8019af)
firewall/post: drop useless parameter

cloud::firewall::post::log was not used, let's drop it.

Change-Id: I616ab85e8ba6d1399fc8999a790b883486324128
(cherry picked from commit 3ce0d9e3d304d5145b7c3422edd82399b74581e2)
loadbalancer: allow to change HAproxy monitor VIP

Some use-cases require to be able to change a the VIP for HAproxy
monitor interface binding.
False by default to keep the Public VIP if not specified.

Change-Id: I48ae2039234baadffd5c921937fd33cc496f864c
(cherry picked from commit d993558346953ac6999b6b75a728a5cd79c9afe2)
Update the README with new Wiki page

Update the README indicating the new wiki page:
https://wiki.openstack.org/wiki/Puppet-openstack/puppet-openstack-cloud

Change-Id: I4460bf5f2bf2ce1e858e23a89421b19d003fe501
(cherry picked from commit c44bf8190d0fd8faa803328e98c8b9b542598688)
Bring ML2 Linuxbridge plugin support

* Allow to use ml2_lb agent (ML2 with linuxbridge)
* Add linuxbridge to mechanism_drivers in Neutron Plugin configuration
  when using ML2.

Change-Id: Ic80b3c6830f36cae10a292329cf207f5996ce778
(cherry picked from commit f1391db64ae719ac90a9bbc13dfb3ea580ba5307)
Merge pull request #733 from enovance/backports

Backports from upstream