Prepare module for publication to the forge

Prepare module for publication to the forge

  This commit validates the module's metadata.json by comparing
  dependent module versions with those in the Puppetfile[1] found in
  puppet-openstack-integration, updates required open source puppet and
  PE versions, cleans up the supported operating system list so that we
  only declare support for the OSes we know kilo runs on.

  Obligatorily bumps the z version number.

  [1] https://github.com/openstack/puppet-openstack-integration/blob/stable/mitaka/Puppetfile

Change-Id: I7f8ae588f2f16c8cbdf50feec8c662e34dd5efee