Update git submodules

* Update docs/submodules/releng from branch 'master'
  - dovetail change tag to cvp.0.2.0

    after https://gerrit.opnfv.org/gerrit/#/c/36775/ merged
    let it run in CI

    Change-Id: I46a4a55aab673c346291428eccdc24c77cfd8bc4
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 31d1e78..52652df 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 31d1e783092774c8f117e32a8dac97ca3e6931ad
+Subproject commit 52652dfc80da5267910a952272f863070a0e7a06