Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 6737d7bc6e65c7bd9b5221edf13c2abcf124a7c2
  - Change docker image name for samplevnf to rapid

    Image name changed from samplevnf to rapid to better reflect the image content.
    Added relevant people in the distribution list.

    Signed-off-by: Yury Kylulin <yury.kylulin@intel.com>
    Change-Id: I8afd269bfae191cd54b2c476ef6b1a5b86a32749

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b949e45..6737d7b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b949e4555f09b879781c964b65252e5477dbad25
+Subproject commit 6737d7bc6e65c7bd9b5221edf13c2abcf124a7c2