Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix unset RC_FILE_PATH in Scripts"
  - Fix unset RC_FILE_PATH in Scripts

    Even though RC_FILE_PATH is defined in Jenkins as passed in as a
    parameter, bash still sees it as unset. Removing the 'nounset' option
    from these scripts should allow the check to success (RC_FILE_PATH set
    to blank).

    Change-Id: Ibcfdcf0d2a12c8119d2fe3ec3b354be782338bd5
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>