Preparing for 3.0.0 Havana release

Updated Modulefile with current release version.
Updated README.md with deprecation warning and release notes.
Updated fixtures to point to stable/havana branch

Change-Id: I1e1f70d6ddaa41c0ac71b4d4b44c91d745ee3e8f
Allow running of proxy and storage on the same node.

This adds a if defined check to avoid class conflicts
when running swift proxy and storage on the same node.

Change-Id: I60fb78e5d40605ab47f349d154737ef9bab641f4
(cherry picked from commit 4b9e74a7a275f32217d86487f975c8ded85317b2)
Merge branch 'stable/havana' of https://github.com/stackforge/puppet-openstack into havana
Merge branch 'stable/havana' of https://github.com/stackforge/puppet-openstack into havana