Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[Compass4nfv] upgrade OpenStack Pike version"
  - [Compass4nfv] upgrade OpenStack Pike version

    Compass4nfv has supported OpenStack Pike version
    switch the master to run Pike version

    Change-Id: I69b5ec54d0e7479fabfe4c2e06d916472427bdb1
    Signed-off-by: wutianwei <wutianwei1@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7054594..4b46bde 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 705459455f4671872a6cb44e257bb77fbfbd9863
+Subproject commit 4b46bdeac6b95119a435671fbdd2f12e91d9daf8