Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Reviewers Guide document for fraser release.

    Images have been updated to depict the latest changes
    in Dovetail Web portal.

    Change-Id: I4dc928141856fab34670272fcc465bea3f6156db
    Signed-off-by: dimitris.tsiolakis <dmts@intracom-telecom.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index a18e2b0..cfa402b 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit a18e2b0d45c631709e457530f6f9d0b52f552156
+Subproject commit cfa402bae022e7e288f9d9eaa3582f22fd39c42e