Merge branch 'devel-2.1'

* devel-2.1:
  RAPI: /2/{nodes,instances}/$name should return 404 for unknown items
  ganeti-masterd: Improve error logging for client requests
  Return disk_template from LUQueryInstanceData
  RAPI client: Rename Get{Node,Instance}Info, add new GetInstanceInfo
  RAPI client: Log request to be made
  Add missing documentation for RAPI instance creation mode
  Add checks for master IP in cluster verify
  Remove unused import from daemon.py
  utils.IgnoreSignals
  AsyncUDPSocket.handle_error
  Add a forgotten comment about overriding a method
  ganeti-noded: add the --no-mlock option
  Describe more ganeti-noded options in the manpage

Conflicts:
	daemons/ganeti-masterd: Trivial
	test/ganeti.backend_unittest.py: Trivial
	test/ganeti.utils_unittest.py: Trivial

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