[th/ethtool-new-offload-features] ethtool: add more offload features that kernel supports

New features:

• ethtool.feature-macsec-hw-offload
• ethtool.feature-netns-local
• ethtool.feature-rx-gro-list
• ethtool.feature-rx-udp-gro-forwarding
• ethtool.feature-tls-hw-rx-offload
• ethtool.feature-tx-gso-list
• ethtool.feature-tx-lockless
• ethtool.feature-tx-tunnel-remcsum-segmentation
• ethtool.feature-vlan-challenged