Merge branch 'stable-2.14' into stable-2.15

Merge branch 'stable-2.14' into stable-2.15

* stable-2.14
  Do not version generate file tools/ssl-update
  Revision bump for 2.14.1
  Update NEWS for 2.14.1

* stable-2.13
  NEWS: move 2.13.0 beta/rc to their place
  Document data collector options
  Correct NEWS file entry
  Revision bump for 2.13.2
  Update the NEWS file for 2.13.2

* stable-2.12
  Bugfix in checkInstanceMove function in Cluster.hs
  Revision bump for 2.12.5
  Update the NEWS file for 2.12.5
  Update Xen documentation in install.rst
  Clarify need for the migration_port Xen param

Conflicts:
	NEWS: take all additions
	configure.ac: keep all version information
	    from stable-2.15

Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>