- fixed up lustre_mds.h to allow inclusion in userspace testreq.c

- fixed up lustre_mds.h to allow inclusion in userspace testreq.c
- added ptlrpc_abort_bulk() to help cleanup aborted requests
- changed giant obd_support.h enum into #defines, which will save me hours of
  counting.
- fixed the ioctl interface to the MDC, so testreq works again
- gave testreq a real interface, to just run one test at a time
- ptlrpc_abort() was freeing a variable which would almost always still be NULL.
  Fixed.