Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Bring in newer glusterfs for mtime unsplit brain

    Recent commit 8ba3a1a (Switch nofeature-ha compute nodes to UCA repo)
    bumped the reclass/system submodule and brought in upstream commit
    2ee306b (Glusterfs: use automatic mtime-based split-brain resolution)
    which requires support for "cluster.favorite-child-policy", not
    available in Glusterfs 3.7.x available in Ubuntu Xenial.
    NOTE: UCA does not provide glusterfs for "Ocata", only for "Pike"+.

    Instead of reverting the commit switching to mtime brain un-split,
    bump glusterfs to a version that is not EOL (3.10) using their
    official PPA.

    Change-Id: I4606dda2f3d4b7563eea793cc8e5d1380f336f24
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>