Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Enable OVP tests to run on a DPDK-enabled system

    DPDK-enabled NFVIs require support for hugepages which
    in turn is configured by means of extra_specs in flavors.
    Currently, Functest enables hugepage support if the name
    of the scenario contains the substring "ovs".

    Dovetail allows end users to run all tests on DPDK-enabled systems
    and the documentation has been updates accordingly.

    JIRA: DOVETAIL-665

    Change-Id: If4898da168f8b4c69a045ef3b00b8a8862f29b0c
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 29b70b6..6dbc1a9 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 29b70b6da1cbae16f6c6332e54ac146c8a2fc106
+Subproject commit 6dbc1a9452d6c8451f759b7be73ac3986f6f4fd4