Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Improved creator/state machine classes class hierarchy."
  - Improved creator/state machine classes class hierarchy.

    Created abstract superclasses for all classes responsible
    for deploying and maintaining the state of objects deployed
    to OpenStack which should help developers better understand
    the library.

    JIRA: SNAPS-183

    Change-Id: I7651bd338f0d4e4086abbc11755e6be4f19058bd
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>