Merge remote branch 'origin/devel-2.4'

* origin/devel-2.4:
  Fix errors in hooks documentation
  Clarify a bit the noded man page
  Note --no-remember in NEWS
  Switch QA over to using instance stop --no-remember
  Implement no_remember at RAPI level
  Implement no_remember at CLI level
  Introduce instance start/stop no_remember attribute
  Bump version for the 2.4.2 release
  Fix a bug in LUInstanceMove
  Abstract ignore_consistency opcode parameter
  Preload the string-escape code in noded
  Fix error in iallocator documentation reg. disk mode
  Try to prevent instance memory changes N+1 failures
  Update NEWS file for the 2.4.2 release

Conflicts:
        NEWS                (trivial)
        doc/iallocator.rst  (kept our version)
        lib/cli.py          (trivial)
        lib/opcodes.py      (removed duplicated work, both branches
                             introduced the same new variable
                              PIgnoreConsistency :)
        lib/rapi/client.py  (trivial)
        lib/rapi/rlib2.py   (almost trivial)
        qa/ganeti-qa.py     (below trivial)

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>