Merge into master from pull request #313:
openflow_input: add TLVs for NAT gentable (https://github.com/floodlight/loxigen/pull/313)
wireshark: make enums global instead of local

These were exceeding the limit of 200 locals.
Merge into master from pull request #314:
wireshark: make enums global instead of local (https://github.com/floodlight/loxigen/pull/314)
openflow_input: add new TLV