Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Remove all alias tempest test cases in osinterop test specificaion docs

    1. Some tempest test cases have alias test cases because of the different
       versions of tempest.
    2. However, Dovetail fixes the version of tempest to be 14.0.0 in its first
       release. So the number of test cases that can be executed in osinterop
       is always 205. And for different SUTs, the 205 test cases are all the same.
    3. In this situation, there is no need to list the alias test cases.
    4. Just list all the 205 test cases which will not confuse users when they
       reading dovetail docs.

    JIRA: DOVETAIL-566

    Change-Id: I5e39dd82314833c8c0a6c1732c990f671ae64420
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 2f66eb6..2547caf 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 2f66eb616f3b6bc856c70ea56f3b99067e1c4418
+Subproject commit 2547cafddd44181c1f08b7df77f9c0b2cdb03eb7