* origin/devel-2.1:
  RAPI client: Implement old instance creation request format
  rlib2: Use constants for disk and NIC parameters

Conflicts:
	test/ganeti.rapi.client_unittest.py: Trivial
	test/ganeti.rapi.rlib2_unittest.py: Trivial

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