Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Refactored neutron_utils#get_subnet_by_name() to get_subnet()"
  - Refactored neutron_utils#get_subnet_by_name() to get_subnet()

    Renamed utility function and added a subnet_settings parameter to
    hold a SubnetSettings object to help make the query more robust
    by being able to leverage values on the settings object.

    JIRA: SNAPS-165

    Change-Id: I226a1217dc4ba7bb50f7d985ecfaf3b7bc4f610b
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>