Update git submodules

Update git submodules

* Update python-masakariclient from branch 'master'
  to 916f5dcd332ff6e954ea38fbfecffb2d3028922b
  - Merge "Remove unnecessary hacking from test reqs"
  - Remove unnecessary hacking from test reqs

    It is used in only pep8 target which does not actually use
    the requirements files.

    Also remove the outdated note about pip's dependency resolver and adds
    the note about lower bounds (which are no longer tested).

    Change-Id: I213ec4f4132332d756ea147f42bb46413ef918a4
    Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>