Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Bugfix: sdnvpn test cases failed due to wrong module name"
  - Bugfix: sdnvpn test cases failed due to wrong module name

    SDNVPN test cases failed due to wrong module name.
    The module name needs to be changed into "sdnvpn.test.functest.testcase_1"
    Refer to patch https://gerrit.opnfv.org/gerrit/#/c/41385/
    Currently Dovetail uses functest:cvp.0.5.0 which uses module name "testcase_1".

    JIRA: DOVETAIL-510

    Change-Id: I3232760d3af34125c7da71a5d2c62ca32693c82b
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index f063348..98e068e 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit f0633486049e9e2d09001fd5c2a599a722f76d03
+Subproject commit 98e068ebee68513afc2b25acaa0c9112f447b80b