Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  to d20dd6a164c77ab9acbfb1d74ea39a991d942e43
  - Refact API module

    Change-Id: Ifa01fcbb848d3218619c1f8e726f26476773ce2f
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 01bca75..d20dd6a 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 01bca75cc4af1665918a04c2a9a8c36dfb473d77
+Subproject commit d20dd6a164c77ab9acbfb1d74ea39a991d942e43