Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - [web-cvp]Direct drill-down for failed tests

    JIRA: DOVETAIL-531

    people may want to directly drill-down to the exact log file of each results, instead of searching in piles of log files.

    Change-Id: I6e18b8d57739fd695e20ee29147e796de5c9e404
    Signed-off-by: grakiss <grakiss.wanglei@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index ea0354e..4f2c619 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit ea0354ea16202b9d49e7320317a65402bab8f811
+Subproject commit 4f2c6191c68567e3fd7ee7e8bcb737c3194fbb2e