Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "Test case specification for VIM Network"
  - Test case specification for VIM Network

    1. Add the alias VIM Network test cases into testscope.
    2. Add test case specification for VIM Network.

    Change-Id: I133ad13b1f926e0093d92a9a39d88947648122ea
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 1fb4ff1..0986edf 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 1fb4ff1c309018d42645bfbb344d2be9dd4ac9cd
+Subproject commit 0986edf28d6df63b6ca8d723755e956cf60b652a