Update git submodules

Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Ensure the project for volumes are handled properly.

    Although this patch has added the project_name member to
    VolumeConfig, it does not work properly due to a cinder bug
    https://bugs.launchpad.net/cinder/+bug/1641982. However, the
    code will now allow for volumes with the same name to be
    created on the same pod just as long as they do not exist
    within the same project/tenant.

    JIRA: SNAPS-270

    Change-Id: Ia6f98e9b66793a69c0205d2d8e38bb3d03f3333e
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>