Fix a case switch that is not handling unknown instruction types with a default case, leading to a crash if the instruction type is unknown.
Add a simple utility program useful for debugging. The program prints the content of OF messages stored in a file. I use a combination of tcpdump and tcpflow to dump OF messages.
C&P
Bump max entries to 4096.
Fix conformance to specifications for Set-Field VLAN_VID

OpenFlow Specification 1.3.3 (https://www.opennetworking.org/images/stories/downloads/sdn-resources/onf-specifications/openflow/openflow-spec-v1.3.3.pdf), p. 65:
"The value in the payload of the OXM TLV must be valid, in particular the OFPVID_PRESENT bit must be set in OXM_OF_VLAN_VID set-field actions."
Merge pull request #68 from mcanini/master

Fix a case switch that is not handling unknown instruction types with a ...