Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Return back glusterfs client state

    In order to set properly keystone fernet keys, apply glusterfs client
    state before second keystone server state. Also leave out user/group
    settings for glusterfs volume of nova instances as it will be set later
    by nova compute packages themselves.

    Change-Id: I069e37c67f08c51ed29f45cf6f92d4a00a1ac97b
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 0224929b3a87d0e0ec011311c46872e6142497cf)