Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Change the directories of results and some files to DOVETAIL_HOME"
  - Change the directories of results and some files to DOVETAIL_HOME

    JIRA: DOVETAIL-438

    Dovetail tool has moved the results dir, pod.yaml, id_rsa and env_config.sh
    from /home/opnfv/dovetail/results and /home/opnfv/dovetail/userconfig to
    $DOVETAIL_HOME. See https://gerrit.opnfv.org/gerrit/#/c/35325/

    Change-Id: Ib47b68bd380bfedd4c0d84429d3bb41914a9a150
    Signed-off-by: xudan <xudan16@huawei.com>