Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Update test list for OS interop tests

    The OpenStack Interop WG has recently deprecated [1] 4 cinder volume
    reservation tests. As a result, they are not part of Functest's set of
    interop tests anymore. This patch cleans up the test case validation
    list for the web portal.

    [1] https://review.openstack.org/#/c/583970/

    Change-Id: I183602b099cb4d44c6cb3d21af6acaa4d3ee01ca
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index c266472..16ec1f4 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit c266472c9dea9f1a3d58e9a70f761d792ac798dd
+Subproject commit 16ec1f400882a80c2762c2b1667af81089555591