Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Set the lint job shell to /bin/bash

    The default builder in Jenkins is '/bin/sh -ex'. Because of this lint
    jobs are failing that we assume won't as everywhere else we've used
    /bin/bash and explitily set options when needed.

    Explicitly setting these jobs to use /bin/bash should keep Jenkins from
    failing builds without reporting the lint results.

    Change-Id: Ibe6cad979d6dcf30e7991873c9ac446ae3bf3a8b
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 00b1600..606a189 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 00b16002d3e31c6d692c78907b3885a7aff778cb
+Subproject commit 606a18946b901e57f5910cbeaf28cb8367414941