Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Require 100% Coverage

    This patch applies strict requirement for full coverage of python
    code as an acceptance criterion.

    Change-Id: Ib6dad44eb4e270efba912ce482676c360da15d84
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 383a21e..28d0f1e 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 383a21e6a2a493a82acf52a4b18f58f41e586497
+Subproject commit 28d0f1e51cb3dfc3a8741d82cc6c1811391efaac