Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - lib.sh: Fix mcp key owner for OPNFV Jenkins jobs

    In case of non-root deploys (i.e. running `ci/deploy.sh` without
    sudo), the OPNFV Jenkins slave executes it under a user shell,
    under a root shell, e.g.:
    $ sudo sudo -u jenkins bash
    $ echo $USER
    jenkins
    $ echo $SUDO_USER
    root

    Adjust lib.sh to only use SUDO_USER when it is not "root".

    Change-Id: I6dd1c8a5dd3a3b02cfb760818d66e99f49709a5b
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 9720ddf..7b21789 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 9720ddf955b76d678a08dc7ea53684400c659ce3
+Subproject commit 7b217895f7b379d396a9bac9a87590be832dc1cf