Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "add defcore/ha testcases to proposed_tests"
  - add defcore/ha testcases to proposed_tests

    JIRA: DOVETAIL-398
    JIRA: DOVETAIL-399

    1. this testsuite will run in community CI, see
    https://gerrit.opnfv.org/gerrit/#/c/33509/
    2. HA testcases please see
    https://wiki.opnfv.org/pages/viewpage.action?pageId=8684344
    3. vimops testcases deleted, since it's covered in defcore

    Change-Id: Ied9c8867e0aa99e33fd213030e6471aa5cfb86e8
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 5f563a9..87a9fea 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 5f563a9b99378362a11d9cf1b0fb6c544a9fc077
+Subproject commit 87a9feab5ffefcf38f5279c13058e5c67603583c