Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - The refstack file name has been changed

    The original refstack results file is refstack/refstack.log
    For Fraser, it has been changed into refstack/tempest.log

    Change-Id: I7d40abe0c5a366b5fbb1912ec58d15109f22c0d0
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 13877a0..cb02bcc 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 13877a00e5155ee93bb4255a81e104c1ebf1f11e
+Subproject commit cb02bccdef30575bb46080475ca13fdf8b6b4b2f