Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 1a879379fdb76cb778d6ffec348c5c6a68fda8be
  - Merge "Ignore Test Repositories when generating Archive"
  - Ignore Test Repositories when generating Archive

    Ignores the 'test' repositories created in Gerrit as they don't contain
    any actual OPNFV code.

    This may break if we ever add a project that begins with 'test' in the
    name but I expect the chances of that are low.

    Change-Id: I633ce85e85c82d4c5ff85a4fb66bddf891cd0bfb
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>