Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Comment Pending JJB Changes on Patchset"
  - Comment Pending JJB Changes on Patchset

    Each time a patchset is created that has an effect on Jenkins jobs, a
    non-voting job will trigger that comments to Gerrit which jobs are
    added, modified, or deleted.

    This should help developers judge the overall impact an individual
    patchset may have on Jenkins since JJB macros can be expanded to
    any number of jobs.

    Change-Id: I99f9b68bc7933abfa39a941d6e65a73f62e58e56
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>