- Made spacing consistent between obj.{h,c} and controller.c everything
  uses 4 spaces now.
- Moved the cn_switch_t and cn_port_t object decls into obj.h
- Moved the constructors and destructors of cn_port__ and cn_switch_t
  into obj.c
- Combined the cn_node_t and cn_flow_t constructors/destructors with
  their cnc_* equivalents
- Made all the naming in obj.{h,c} consistent
- Fixed the naming and imports for the metadata service interface

As of now, everything is compiling except for controller.c. I think that
one is going to require some actual logic changes (due the way that
obj.{c,h} changed). I'm checkpointing these changes so I can get to work
on fixing the logic issues.