Adding unpadded Instruction Ids for ofp_table_features_prop_instructions*

This pull request is not ready for merging. The python objects seem to be generated correctly, but I'm having some trouble with the C side of things. I attempted to replicate how action_ids were implemented, but the tests are failing at

```
test of_table_features_stats_reply_OF_VERSION_1_3:
TEST LOCI_ASSERT FAILURE bsn_disable_src_mac_check->object_id == OF_INSTRUCTION_ID_BSN_DISABLE_SRC_MAC_CHECK :: src/test_common.c:180498
\nASSERT 0. src/test_common.c:180498\nmake: *** [check-c] Aborted (core dumped)
```

If you see any obvious errors I've made, I'd be grateful if you would point them out. I'll continue to work on this problem tomorrow, and comment here if I resolve the C messages.