Changes required to adopt new loxi APIs into legacy OFMatch:
1. Added value getters to new value types
2. Changed Match, MatchBuilder interfaces according to new desing
Updated masked handling in Match interface and MatchBuilder
Merge remote-tracking branch 'yotam/master'
java_gen: support 'template_dir' var in context
java_gen: generate more classes
java_gen: make channel utils version specific
java_gen: cleanup / preparations for Match
java_gen/U64: support parseHexString
of_class: support custom template stanzas for of_match
frontend: raise Exception if unknown how to create member
test_data: add flow_mod java stanza
loxi_ir: add support for byte alignment of messages, superclass
java_gen: align messages (for OFMatchv3)