Enable OVP tests to run on a DPDK-enabled system

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>