Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge changes from topic 'bug/yardstick-864'

    * changes:
      Replace assertEquals with assertEqual
      Make files pep8 compliant before using assertTrue|False

  - Replace assertEquals with assertEqual

    unittest.assertEquals is deprecated[1], and has been replaced with
    unittest.assertEqual.

    [1] https://docs.python.org/2/library/unittest.html#deprecated-aliases

    Change-Id: I9c6320e3a9ec5528036b529a9c32fc48b0bcfd62
    JIRA: YARDSTICK-864
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>
  - Make files pep8 compliant before using assertTrue|False

    JIRA: YARDSTICK-903
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>
    Change-Id: Id7912b5ddee36e7366bcfa824379853efd0a89f1