Merge into master from pull request #33:
Fix OF 1.3 flow mods, flow stats, and OXM (https://github.com/floodlight/loxigen/pull/33)
locitest: add Makefile

This greatly speeds up incremental compiles (along with ccache).
locitest: generate tests from the test_data files

The "c" section of the test data file should allocate and populate a LOCI
object. The resulting wire buffer is compared to the "binary" section.

This only tests serialization, but given that we have autogenerated tests that
round-trip each object I think this is sufficient.

I added C sections to the OF 1.0 test data files. OF 1.3 tests will come in a
future pull request.