Merge branch 'stable-2.5' into devel-2.5

* stable-2.5:
  htools: rework message display construction
  hbal: handle empty node groups
  Document OpNodeMigrate's result for RAPI
  Fail if node/group evacuation can't evacuate instances
  LUInstanceRename: Compare name with name
  LUClusterRepairDiskSizes: Acquire instance locks in exclusive mode
  Update NEWS for 2.5.0~rc4
  Bump version to 2.5.0~rc4
  jqueue: Allow zero jobs to be submitted at once
  hail: don't select the primary as new secondary
  hail: add an extra safety check in relocate
  Bump version to 2.5.0~rc3

Conflicts:
	configure.ac: Trivial

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>