Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Test case description for Yardstick HA case

    This is test case description for HA
    test neutron-l3-agent. Yardstick TC058.

    JIRA: DOVETAIL-637

    Change-Id: I90e0225e6f086982da9f6ea686fbc8c179f45984
    Signed-off-by: Mika Rautakumpu <mika.rautakumpu@nokia.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 9bcf076..d6d2b04 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 9bcf07699d17a437ed7d413df7151903aaa2724f
+Subproject commit d6d2b0471f637158592e0a32bbec35c205ceb2de