Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Add missing unit tests for test_runner file

    JIRA: DOVETAIL-724

    This patch adds unit tests for Runners classes methods of Dovetail
    which were missing.

    Change-Id: Ib985a44db86be02a7b9cefb8deca187bb50e78cc
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>
  - Add missing unit tests for container file

    JIRA: DOVETAIL-724

    This patch adds unit tests for container class methods of Dovetail
    which were missing.

    Change-Id: Iaba3bbfbb8838278e20ac9f63ef6e01f9ada1cbc
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>
  - Add missing unit tests for cli files

    JIRA: DOVETAIL-724

    This patch adds unit tests for cli methods of Dovetail which were
    missing.

    Change-Id: I99c584007659401e298e58aebb1764df1c543894
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index c92c49a..4ef204b 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit c92c49a9031602030f0f4d4fe2f99a9054eabaee
+Subproject commit 4ef204b5156b31bc2beae614765d53d9dcf5ea16