Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "fix yardstick openrc location"
  - fix yardstick openrc location

    since yardstick changes its openrc location
    see
    https://gerrit.opnfv.org/gerrit/#/c/32861/

    Change-Id: Ib85910fe5521fb398c47e389e2baf127342b1c0b
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 4bb7cb4..002d7cb 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 4bb7cb467da755537d8f51be1a7966bc6700afad
+Subproject commit 002d7cb256e4f0753f4b738d7f3d2a7872704314