Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Implemented the ability to create Magnum Cluster Type objects.

    This patch is the second of several necessary for the addition of
    Magnum support. This one implements a create and delete function
    to magnum_utils.py as well as the necessary config and domain classes
    for sending and receiving Cluster Type data to OpenStack.

    JIRA: SNAPS-233

    Change-Id: Iad1959b98eaabc4ef5f41b70a23f6b1306259650
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>