Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 7d6033ea6f9301a5dd6a3913a6a2990bd52eda76
  - Merge "Remove ericsson-build3 from Jenkins"
  - Remove ericsson-build3 from Jenkins

    This build machine hasn't been online for quite a while and may no
    longer exist.

    Removing so no more builds are scheduled on the node.

    Change-Id: I59c1c81b1777b038034f918d4db6073ce6986787
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 29091f0..7d6033e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 29091f057109344db49a956f663ca16c738f7a3b
+Subproject commit 7d6033ea6f9301a5dd6a3913a6a2990bd52eda76