Merge branch 'devel-2.5'

* devel-2.5:
  Use --yes to deactivate master ip in cluster merge
  Use deactivate-master-ip in cluster-merge
  Add gnt-cluster commands to toggle the master IP
  Split starting and stopping master IP and daemons
  listrunner: Don't pass arguments if there are none
  ssh: Quote strings in error message
  utils.log: Write error messages to stderr
  Add signal handling doc to hbal man page
  Migration: warn the user about hv version mismatch
  Fix handling of cluster verify hooks
  Redistribute the RAPI certificate
  QA: Add tests for instance start/stop via RAPI
  RAPI: Fix wrong check on instance shutdown
  baserlib: Accept empty body in FillOpcode

Conflicts:
	lib/backend.py
   - no real conflicts
	lib/constants.py
   - preserve both changes
	lib/rapi/rlib2.py
   - keep master
	lib/rpc.py
   - no real conflicts
	tools/cluster-merge
   - keep devel-2.5

Signed-off-by: Andrea Spadaccini <spadaccio@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>