Set MYSQL_HOST parameter to better support multi-node mode.

When deploying openstack with multi-node mode,
mysql needs to be started by listening it's real ip, not localhost.
but devstack always use localhost to recreate databases that will
lead bellow errors.

Fix bug 1177735

Change-Id: I50284f469a998d023a41b4796f1dc775bb52e710
Add pbr to devstack.

It's being used in all of the core projects, so we should install it
at the start so we can ensure that we don't break everything all at
once.

Change-Id: I326d724264803e88315ee9e40f4634836baf6e0b
Add Debian OS support in DevStack

Fix bug #1176216

Change-Id: Ia94c332f02a921a936db249dc3b4a7ae4eff0400
Update the package name of qpid in the fedora platform

The package name of qpid in default yum repository
is qpid-cpp-server, not qpid-cpp-server-daemon.

Fix bug 1177731

Change-Id: I4412029966583f5ef5a5a4cc80e7fdc4771c8eca
Merge "Set MYSQL_HOST parameter to better support multi-node mode."
Merge "Add Debian OS support in DevStack"
Merge "Add pbr to devstack."