Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Move Barometer Builds to lf-build2"
  - Move Barometer Builds to lf-build2

    Adds specific parameter for 'lf-build2' so it can be referenced with
    the '{build-server}-defaults' syntax and assigns barometer verify and
    merge jobs to lf-build2.

    Change-Id: If68dfc4e6ea81884870047360051795407c15af3
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3819a50..7c553aa 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3819a506b39b93839a3745d2eed84d24c1683b87
+Subproject commit 7c553aa25016978ed54c0659f4005c8153bfed89