Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Bugfix: Permission denied when generate openrc file"
  - Bugfix: Permission denied when generate openrc file

    JIRA: DOVETAIL-438

    Error log:
    touch: cannot touch ‘/home/opnfv/cvp/pre_config/env_config.sh’: Permission denied
    fetch_os_creds.error: Cannot create the file specified. Check that the path
    is correct and run the script again.

    Change-Id: I46d1edacec58226bc6b5d6a88ab7b5b6cdea17f5
    Signed-off-by: xudan <xudan16@huawei.com>