Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Build opnfv/functest-kubernetes:fraser"
  - Build opnfv/functest-kubernetes:fraser

    Change-Id: I449117bf03498a6b5bfe72ae3038fe7e0d2165fe
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 1700372..4cda72c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 1700372dd68d072fbd77cb3b739a4cf5c9e6aec4
+Subproject commit 4cda72c097f7cc44bdefe32d58ca6bf22aa27802