Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[dovetail] Bugfix: incorrectly exit when file doesn't exist"
  - [dovetail] Bugfix: incorrectly exit when file doesn't exist

    When checking files, it shouldn't exit when getting an non-zero results.
    However, the scripts set -e at the begining.
    In order to continue the following steps when the file doesn't exists, replace
    all "return 0" or "return 1" to be "echo 0/1".

    Change-Id: I28ea81d52182d4dc5db56d47abbfbc1761f17d81
    Signed-off-by: xudan <xudan16@huawei.com>