Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[Functest] Provide credentials to Functest as a volume"
  - [Functest] Provide credentials to Functest as a volume

    The OpenStack credentials shall be fetched from jjob
    and provided to Functest as a docker volume.
    This way, Functest framework doesn't need to do it.
    It will assume the RC file is already present.

    Change-Id: I7a94ffffaefe65911594a9894b60b10cd13735ad
    Signed-off-by: jose.lausuch <jose.lausuch@ericsson.com>