Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Modify title and references in guidelines addendum doc

    - Add 2018.01 to title to match reviewer guide, release notes, etc. as
    this document may change per release
    - Modify link for Governance Guidelines to reflect ratified doc on
    opnfv.org domain

    Change-Id: Ifdaa287b2919c44d408aa0ddd0b164b8ca4f406d
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index db4e7c1..abf0aff 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit db4e7c1d09a3d1d0b48dd3136817c30f0b2af5ff
+Subproject commit abf0aff0c239e1011d43bc0c12a2acd7335bb924