Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Enable the web portal to show all endpoints

    The endpoints info for the 2018.08 has been changed.

    The web portal needs some adaptions for the new data format.

    It keeps the same as 2018.01 and doesn't need to change dovetail-webportal.

    JIRA: DOVETAIL-725

    Change-Id: I74cde3aa6032c7afac4b6ce1d2146e09a0f99fe5
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 16ec1f4..3f92680 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 16ec1f400882a80c2762c2b1667af81089555591
+Subproject commit 3f92680059a8371ec6002e1d909cd89cc4bab96d