Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [OVN4NFV] Stable branch for OPNFV Gambia release

    Change-Id: I3bcc79438dcb552de3056dbd5e0cf263f327da28
    Signed-off-by: Trinath Somanchi <trinath.somanchi@nxp.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7324863..1c3f2c4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7324863fe0c79b57078557c8f4494a9fc3b8c25c
+Subproject commit 1c3f2c49c82e438cd58c1cd6d8ad1a8739d94da5