Merge branch 'devel-2.3'

* devel-2.3:
  jqueue: Keep jobs in “waitlock” while returning to queue
  Improve jqueue unittests
  Update manpages to display version 2.3

Conflicts:
	man/ganeti-cleaner.sgml: Removed
	man/ganeti-confd.sgml: Removed
	man/ganeti-masterd.sgml: Removed
	man/ganeti-noded.sgml: Removed
	man/ganeti-os-interface.sgml: Removed
	man/ganeti-rapi.sgml: Removed
	man/ganeti-watcher.sgml: Removed
	man/ganeti.sgml: Removed
	man/gnt-backup.sgml: Removed
	man/gnt-cluster.sgml: Removed
	man/gnt-debug.sgml: Removed
	man/gnt-instance.sgml: Removed
	man/gnt-job.sgml: Removed
	man/gnt-node.sgml: Removed
	man/gnt-os.sgml: Removed

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>