Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 7dbe125db3f6eca9ba86933a4afe0cf2d76fc04d
  - barometer-collectd-experimental.

    gamiba is old, we can use hunter,
    at least that passes jjb

    Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>
    Change-Id: I08a59d2a0d009de8f653ff11db6046f18f46d22a

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c278e14..7dbe125 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c278e14d818ab6fc6f4e6b7c73d1abaf0a486410
+Subproject commit 7dbe125db3f6eca9ba86933a4afe0cf2d76fc04d