Update git submodules

Update git submodules

* Update upstream/fuel from branch 'stable/colorado'
  - build/docker: Reuse tagged image for OPNFV build

    During CI build loops, the workspace is freshly fetched,
    so '.docker' make target is built each time.

    Reuse existing 'opnfv.org/ubuntu-builder:14.04' tag if present, but
    enforce a configurable lifespan for this tag (currently 1 day), so
    it does not get stale.

    JIRA: FUEL-204

    Change-Id: I8d1bd81f3e5e81068e9586c9bea9f43b3327eb38
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 638d832527012531b506ec0ba40b297c41bfda0e)