Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Rename ovp.next to be ovp.2018.08

    Change-Id: I32aaee370512c3d7c8d6e1fbb6ef25aebc5d483f
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index e7ec270..354a189 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit e7ec2703fcc6bd37ae4506b2e188727dba88ea72
+Subproject commit 354a18957eb304ed611912cd6fced2a4ff192e0e