Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Modify tempest.conf to enable Tempest failed test cases to pass on Compass"
  - Modify tempest.conf to enable Tempest failed test cases to pass on Compass

    JIRA: DOVETAIL-486

    For compass:
    1. There is a defcore test case always failed due to wrong value of
       volume_device_name=vdc.
       Use tempest_conf.yaml to change the wrong value into 'vdb' for Compass.
    2. There are also some tempest test cases skipped or failed due to wrong values
       in tempest.conf file.

    Change-Id: Ibe274790b14d9223b5c0ee903879f8b67521948d
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5ac27a4..7d2d337 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5ac27a4585038ae1f8cb830732eb1b295ac9bf93
+Subproject commit 7d2d3370744a9f578f9038d658724c631da8c001