Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Disable git tagging during Jenkins git clone"
  - Disable git tagging during Jenkins git clone

    Even with per-build-tag set to false, JJB 1.6.2 does not seem to remove
    'Create tag for each build' from the git-scm settings. Though the option
    is deprecated it is still supported, so setting both of these should
    disable tagging when Jenkins clones a git repo.

    Change-Id: I5977149ad581df67d938ce2b46794d47c5e06fe3
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>