Preparing for 3.0.0 Havana release

Updated Modulefile dependencies and version.
Updated README.md release notes.
Updated fixtures.yml to point to stable/havana branch

Change-Id: I227567f4f2e99c88aa0d9afe054705ff78bad758
Allow running of proxy and storage on the same node.

This adds conditionals to support a installation
in which a user desires to run both swift proxy and
storage on the same node.

Change-Id: I0cc827525968a9d1dc836c553a39f0ac13c4667e
(cherry picked from commit af129f0a93009293dba610ee487a41fb15027336)
Merge branch 'stable/havana' of https://github.com/stackforge/puppet-swift into havana