Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Update postbuildscript syntax for JJB 2.0.3"
  - Update postbuildscript syntax for JJB 2.0.3

    JJB 2.0.3 changed the postbuildscript syntax a bit and requires
    changes so that they work properly with version 2.x of PostBuildScript
    plugin.

    This patch requires that Jenkins also be updated to install the 2.x
    release of PostBuildScript.

    Change-Id: I65e52c8d9b2efa38a3d16193c176c65e87e704c1
    Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>