Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Fixed error in ansible_utils_tests.py and added ansible helper method to the OpenStackVMInstance class."
  - Fixed error in ansible_utils_tests.py and added ansible helper
    method to the OpenStackVMInstance class.

    Test error was due to the image configuration having the incorrect
    user applied. The helper method will make it easier for adhoc
    ansible playbooks to be applied to running instances.

    JIRA: SNAPS-83

    Change-Id: I6b229e0adb836dd3d5ea7b468d38d93f880589a2
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>