Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Bugfix about the ipv6 results checker

    JIRA: DOVETAIL-404

    1. IPV6 sub-testcase's name includes [id], which will affects the regex.
    2. Remove the [id] from the name of the sub_testcases.

    Change-Id: I51b567e8382fa4e701f8b32ba7ea195d49fd31eb
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 87a9fea..37cbf88 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 87a9feab5ffefcf38f5279c13058e5c67603583c
+Subproject commit 37cbf88c26866db4dc180e33fccac59abc1fa586