Value Types: remove unnecessary prefixes from enumeration constants

Some of our Value types had constants with superflous prefixes
e.g., IpProtocol.IP_PROTO_TCP instead of IpProtocol.TCP

This commit removes those
Merge branch 'master' of github.com:floodlight/loxigen
fix loci OXM ordering to match the spec

The C backend will now output OXMs in the same order as the Java backend.
openflow_input: fix naming of group type in group desc stats entry

The C backend blacklists the name "type" so accessors aren't generated.
"group_type" works and is consistent with the other classes.
Merge into master from pull request #86:
Remove unnecessary prefixes from Value Type constants (https://github.com/floodlight/loxigen/pull/86)
Merge into master from pull request #88:
fix loci OXM ordering to match the spec (https://github.com/floodlight/loxigen/pull/88)
Merge into master from pull request #89:
openflow_input: fix naming of group type in group desc stats entry (https://github.com/floodlight/loxigen/pull/89)
Added OFPP_ANY into enum ofp_port
Show enum-member names
Dissect OXM list
Stub reader for instruction list