Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Delete 'default' security group associated to new projects."
  - Delete 'default' security group associated to new projects.

    OpenStack can create a security group named 'default' each time a
    new project/tenant has been created but is not cleaned up when the
    project has been deleted. This patch adds this functionality into
    OpenStackProject#clean() method.

    Also added similar routine to KeystoneUtilsTests#tearDown() method.

    JIRA: SNAPS-169

    Change-Id: I29492ae2ddd82e7d59d09b9c4eb759be4835532a
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>