Merge branch 'devel-2.1'

* devel-2.1:
  Fix consistency checks in ConfdFilterCallback
  Fix utils.WaitForFdCondition inner retry loop
  Fix bug introduced in 76e5f8b5: mkdir mode
  utils: Move wrapper code around os.makedirs into separate function
  Fix unittest for the rapi client library
  Adding RAPI client library.

Conflicts:
	test/ganeti.utils_unittest.py: Trivial

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