Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Update the user guide environment diagrams

    Updated the test user guide diagrams with the correct CVP portal
    web link and removed direct connection between the Test host and
    the CVP server. Online and offline mode refer to installation of
    Dovetail docker and dependent images.

    Change-Id: If2fb62d105557a41b156b90a3d9c956185be0b7c
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index dcd38df..2c607bc 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit dcd38df7c2d69eca8da01cdf710d16ffcc18a0fd
+Subproject commit 2c607bc0ea04cc01be84c7ff7fabdff04b6c7f67