Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Implementation of API validaton exemption in dovetail

    This patch adds the ability to Dovetail to disable strict API
    response validation in Tempest-based test cases run by Functest.

    Corresponding updates of the web portal and backporting of this patch to
    OVP 1.0.0 (Danube) will follow.

    JIRA: DOVETAIL-633

    Change-Id: Iace99ea1b6224ea907a2c3af8676e9285e6ad3ee
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 71ba21f..749946d 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 71ba21ff906d4104a81442d4712aac13cf4906d4
+Subproject commit 749946dcc5b17cfca43c6e8692359f4972e48b21