Use VlanId type in constant declarations
Define struct oxm
Define Ipv6ExtHeaderFlag and use it
Add Oxm interface
Add OxmInPort interface and the underlaying struct
Add embedded field for common OXM structure
Add OxmInPhyPort interface and the underlaying struct
Add OxmMetadata interface and the underlaying struct
Replace Dest with Dst which means destination
Replace Phy with Physical
Add OxmEthDst interface and the underlaying struct
Add OxmEthSrc interface and the underlaying struct
Add OxmEthType interface and the underlaying struct
Add OxmVlanId interface and the underlaying struct
Fix missing mask field added
Add OxmVlanPriority interface and the underlaying struct