openflow_input: add BSN extensions to OF 1.4

I left out the following extensions that are no longer used or have been
superceded by the standard:

 - bsn_disable_split_horizon_check
 - bsn_role_status
 - bsn_global_vrf_allowed
openflow_input: add standard OXMs for 1.3 and 1.4

The pbb_isid OXM will require more work because it uses a 3 byte value.
openflow_input: add new error subclasses for OF 1.4
Merge into master from pull request #343:
Additions to OF 1.4 input files (https://github.com/floodlight/loxigen/pull/343)