Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Remove a sub test case under dovetail.tempest.tc004

    - Fixed vping, ha, sdnvpn test case names to match test specs
    - Removed aliases from VIM operations and matched test case
    name changes in patch https://gerrit.opnfv.org/gerrit/#/c/47691/4
    - CVP to OVP name change

    - A test case was removed from tempest tc004 because of the Tempest
    version from 15 to 14. A reference to it was still in this doc.

    Change-Id: If2e07e15b48ae6bca5ac0e262aead784cd67cd0f
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 25169c2..db4e7c1 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 25169c298818d5d8bd6be1a5d94c9f1b57697972
+Subproject commit db4e7c1d09a3d1d0b48dd3136817c30f0b2af5ff