Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Refactored VmInst domain class for Ports.

    Removed network dict and replaced with a list of Port domain
    objects. The old network member was directly copied into the
    VmInst object from neutron meaning that Neutron implementation
    details were leaking through. This refactor not only makes
    VmInst objects easier to use, it also ensures that future
    Neutron API changes will not break the library.

    JIRA: SNAPS-251

    Change-Id: I3e5e811e433bf7670ecd80405186ac2ac0739def
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>