Changes:
- Updated json-c library to support modern compilers
- Disabled PF_RING by default, we suggest using AF_PACKET for mirror capture
- Disabled LUA Jit support due to very low demand
- Added support for multiple interfaces in AF_PACKET mode
- Disabled fixed CPU allocation for AF_PACKET to improve scalability
- Fixed bytes per second to mbits conversion to correct formula
- Updated Netmap API headers from version 11 to 14