kiji-hive-adapter: KIJIHIVE-40. Escape all field names for structs within columns

Signed-off-by: Daisy Zhou <daisy@wibidata.com>
commit: https://github.com/kijiproject/kiji-hive-adapter/commit/2b02654d1a1b1e8b36c10fdf94c28f5563c9f877