Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Removal of Wenjing Chu from the list of committers

    https://lists.opnfv.org/pipermail/opnfv-tech-discuss/2018-February/020497.html

    Change-Id: Ic2b536551d919e9b66f41ba00dd6dc8b71d93f7b
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 4093219..8a2f0a1 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 40932193dd77dbe9f0387c819fec85c303c8927e
+Subproject commit 8a2f0a1ec2efd518eabc98033ed447e0b3821ff2