Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "barometer_docker: add barometer-snmp to build"
  - barometer_docker: add barometer-snmp to build

    Change-Id: I5dc37a4970df4fc432bc65454872f45466d8749d
    Signed-off-by: Gordon Kelly <gordon.kelly@intel.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 36bc31f..83a7a4a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 36bc31f02c727fde4bba535750d0b40f2cfe11b2
+Subproject commit 83a7a4ac9d2966010eac2b6ce5af2904276e55c8