Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "tagging compass4nfv Fraser 6.1 release"
  - tagging compass4nfv Fraser 6.1 release

    JIRA:-

    fix 3 neutron trunk testcases failure in functest

    Change-Id: Ie3cd55c3aac1b6e1104054b3ab666056efa83b5b
    Signed-off-by: chigang <chigang@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 62707d5..ac20f94 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 62707d59d3eb0e5bd362068bf4918f00673bd027
+Subproject commit ac20f94f10934a3f6909e860bfc5ac19749dcc1e