Update git submodules

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

    Change-Id: I47891ae4b0f48234731043822abe9c54fc7a7655
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 6a6d5c6..0cfd381 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 6a6d5c682f0bb50d29fe483eb3bdfa639b8a876c
+Subproject commit 0cfd381439efc40f82b9f396bc9f6dfb34d6f37c