Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "dovetail: create file pod.yaml for running HA test cases"
  - dovetail: create file pod.yaml for running HA test cases

    JIRA: DOVETAIL-407

    1. HA test cases need a file pod.yaml giving the info of the pod
       (node's ip, username, password/key_file).
    2. Dovetail client has finished the adaption JIRA: DOVETAIL-405.
    3. CI uses create_pod_file.py to generate /home/opnfv/dovetail/userconfig/pod.yaml
    4. If INSTALLER_TYPE is fuel, fetch it's jumpserver key to
       /home/opnfv/dovetail/userconfig/id_rsa

    Change-Id: Iaf6afbdfb8e4331ae9a10ea3df060c37e9010a0a
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0f3ad47..87ceba6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0f3ad47214dd2b6d169dbfd4c0a1b25a51238294
+Subproject commit 87ceba647aa252717ebede6085a89df350f32031