- Converted lots of debugging printks to CDEBUGs

- Converted lots of debugging printks to CDEBUGs
- Removed duplicated debug macros and defines; they live in portals now

- All of OBD's debug information now lives in the Portals debug buffer.
Use 'ptlctl get_debug' to view the buffer.  The buffer's size is currently
hardcoded at 1 megabyte in module.c, but that's easy enough to change to a
module argument.