Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Auto project stable branch for OPNFV Fraser release"
  - Auto project stable branch for OPNFV Fraser release

    on behalf of Tina Tsou PTL

    Change-Id: Ib3779a67a09025b2433520566af060516ab6dc43
    Signed-off-by: Gerard Damm <gerard.damm@wipro.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 11db5ac..a0df693 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 11db5ac9a3535ffd9188db147bb46d1033a45b8c
+Subproject commit a0df693b4e7d567adec158f6cc11b5b7cdadf564