Add test file for q_in_q vport.
Fix bsn_vport subtype, add l2gre vport and test file.
remove q_in_q and l2gre entries in c_gen/type_maps.py.
Add flags to bsn_vport_l2gre.
Add java test for bsn_vport_l2gre and bsn_vport_q_in_q.
Merge into master from pull request #246:
Fix bsn_vport subtype and add l2gre vport (https://github.com/floodlight/loxigen/pull/246)