Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Bugfix: Dovetail failed on Compass master because of lacking cacert"
  - Bugfix: Dovetail failed on Compass master because of lacking cacert

    Dovetail daily jobs on Compass failed because of lacking os cacert file.
    Add the cacert file path into env_config.sh and copy cacert file to pre_config/.

    JIRA: DOVETAIL-564

    Change-Id: I23506bf3dea7ad3e82bd826f4ea344f6ddd99cac
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 65994e7..ffe2347 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 65994e71107f60acd92a16f0fe59db0125d2491a
+Subproject commit ffe23476fdee1f2dbb7ca810a25a96d64dc91be0