Merge branch 'devel-2.5'

Merge branch 'devel-2.5'

* devel-2.5: (29 commits)
  gnt-* {add,list,remove}-tags: Unify options
  Bump version for 2.5.0 final release
  configure.ac: Fix “too many arguments” error
  Fix extra whitespace
  Further fixes concerning drbd port release
  Fix a bug concerning TCP port release
  Fix extra whitespace
  Fix a bug concerning TCP port release
  ganeti.initd: Add “status” action
  Add whitelist for opcodes using BGL
  LUOobCommand: acquire BGL in shared mode
  Fix docstring bug
  LUNodeAdd: Verify version in Prereq
  LUNodeAdd: Verify version in Prereq
  Fix LV status parsing to accept newer LVM
  gnt-instance info: Show node group information
  cmdlib: Factorize checking acquired node group locks
  Bump version for 2.5.0~rc6 release
  cmdlib: Stop forking in LUClusterQuery
  locking: Notify only once on release
  ...

Conflicts:
	NEWS: Trivial
	daemons/daemon-util.in: Copyright line
	lib/client/gnt_group.py: Tag operations
	lib/cmdlib.py: Not so trivial, hopefully correct

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