Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Created domain class for routers."
  - Created domain class for routers.

    Created Router domain class so neutron_utils.py functions returning
    router objects will not be leaking out implementation details as each
    API version can change these data structures and this should all be
    handled by the SNAPS neutron utility.

    JIRA: SNAPS-115 & SNAPS-14

    Change-Id: Ib6d36a735d835a6ed4ede489b14e33a261458fed
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>