Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to cfe8194b57be9fb0d3827b1be0e3f08ca433fd8d
  - Revert "Switch mdsal to using new maven-merge job"

    This reverts commit 23f64b47684853e481bda28ae0f529144596c5b3.

    The job does not correctly deploy all artifacts, leaving
    yang-binding out for some reason.

    Change-Id: I258f1c6b084da8b9ffbf75398e3e45f4af725d2d
    Signed-off-by: Robert Varga <robert.varga@pantheon.tech>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index ca8d1e01967cc13ce2dfa0d5bd3c8902d832f10c..cfe8194b57be9fb0d3827b1be0e3f08ca433fd8d 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit ca8d1e01967cc13ce2dfa0d5bd3c8902d832f10c
+Subproject commit cfe8194b57be9fb0d3827b1be0e3f08ca433fd8d