Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[daisy]Enable jobs for stable/fraser branch"
  - [daisy]Enable jobs for stable/fraser branch

    Now we have had the stable/fraser branch in place [1].
    Let's Re-arrange CI resources for it.

    [1] https://gerrit.opnfv.org/gerrit/#/c/54693/

    Change-Id: Id596b1070c781da4edfd2496a47ea36400268614
    Signed-off-by: Zhijiang Hu <hu.zhijiang@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 19b9672..f175118 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 19b96727f7e29280cb58827f1208c5ebb03deac1
+Subproject commit f1751183fe77d358008ecb0f986fefd9f545b4ad