Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  to a1d9442b3c35042f292f118a4db1b898c6929a22
  - Clean functest-kubernetes jjb

    It removes all debug data added by "Add debugs when calling gsutil"
    [1] and "Print debug infos in functest-kubernetes jjbs" [2]

    The issue came from former data dirs in http://artifacts.opnfv.org/
    which changes logics [3]. All kubernetes latest results were removed
    to solve the issues.

    [1] https://gerrit.opnfv.org/gerrit/#/c/68145/
    [2] https://gerrit.opnfv.org/gerrit/#/c/68113/
    [3] https://cloud.google.com/storage/docs/gsutil/commands/cp

    Change-Id: I4be465b0b6f63bcd77e46440da715d4269d4e79f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>