Disable TSO on all systems

Even on RHEL7 + OSP5, there is an issue on TSO/GSO. So we need to ensure
that it's disable also on RHEL7/CentOS7 systems.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge pull request #618 from enovance/tso-rh

Disable TSO for all systems