Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Refactoring of NetworkSettings to extend NetworkConfig

    This also includes SubnetSettings extending to SubnetConfig and
    PortSettings extenting to Portconfig and neutron_utils have a runtime cyclical
    dependency. This patch reduces this dependency and deprecates the NetworkSettings,
    SubnetSettings, and PortSettings classes.

    JIRA: SNAPS-220

    Change-Id: I996d73d9b910c075a6511a423f01d966f5b6fb74
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>