Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Refactoring of VmInstanceSettings to extend VmInstanceConfig

    VmInstanceSettings, FloatingIPSettings and nova_utils have a
    runtime cyclical dependency. This patch reduces this dependency and
    deprecates the VmInstanceSettings and FloatingIPSettings class with
    snaps.config.vm_inst VmInstanceConfig and FloatingIpConfg classes

    JIRA: SNAPS-218

    Change-Id: I95688130256bca1df4a5c347bdb741019ae0937e
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>