fi_cq_readerr returns a negative value on error. Fix cq_readerr to handle it correctly. Provide prov_errno to fi_cq_strerror to get useful error string.

Signed-off-by: Arun C Ilango <arun.ilango@intel.com>
Merge pull request #54 from a-ilango/master

fix cq_readerr
Merge pull request #52 from pmmccorm/master

Common code + cleanups for fabtests
Fix issues from last merge, add addr_format parser for fi_info.