Disable TSO for 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.
It's about kernel > 3.10, and we consider this release is working on RHEL7 & Debian 7 which have respectively 3.10 & 3.14 kernels.