templated out the device name in ifcfg-ens6.j2 (was harcoded to ens6)
included latest mellanox driver name in mellanoxVars.yml removed MELLANOX_DEVICE_NAME definition from mellanoxVars added info to template ifcfg-ens6.j2
included latest mellanox driver name in mellanoxVars.yml removed MELLANOX_DEVICE_NAME definition from mellanoxVars added info to template ifcfg-ens6.j2