Update git submodules

* Update upstream/fuel from branch 'stable/colorado'
  - build/docker: CI: no tag reuse on env var change
    
    The previous change adding support for OPNFV build tag reuse
    added the get/put-cache functionality to `build/docker` just
    for detecting env var changes between tag creation and current build.
    
    Obviously, when building outside CI, it is up to the end user to
    force a docker rebuild when env vars change (this was the behavior
    before the tag reuse support too).
    
    An alternative approach would be removing get/put-cache completely,
    if we consider the env vars (http proxy related) never change for
    CI cached builds (seems to be true, worst case we wait 1 day for
    the tag to expire when it happens).
    
    This change just fixes the original intended behavior in tag reuse.
    
    JIRA: FUEL-204
    
    Change-Id: I14666994bc334012a5198a64a4a24cd4962e4bd6
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 1c7eb680b34fdcd83b92c43a4c78db3c54bf567b)
    

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