Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "barometer: Add job definition for collectd-master docker image build"
  - barometer: Add job definition for collectd-master docker image build

    Added definition for build & push docker image for
    'barometer-collectd-master' - it is a barometer-collectd
    container that is based on latest master branch from collectd.

    Change-Id: I4d4b7c27971cbeffb8f303ef6b7799cc927d65f0
    Signed-off-by: Radoslaw Jablonski <radoslawx.jablonski@intel.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a9867ae..b25aad4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a9867ae3c77432fc4ad843450a86b6eaacc0a79e
+Subproject commit b25aad403f6ed821053825516517040ef3988f36