Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Create branches via ssh rather than the https"
  - Create branches via ssh rather than the https

    Previously we created the branches over Gerrit's HTTPS interface. One or
    two projects from the previous release did not have their stable
    branches created at the correct place.

    Switch to using ssh for branch creation will be more reliable and easier
    for us to verify.

    Change-Id: If7f24d2b19e74513b59889bd64d25919aa048e4c
    Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>