add tests for file system on devices using protection information v2

Hi all,

this series adds support to exercise I/O on file systems using protection
information in the device, including that corruption is properly
reported.

The second test requires a patch to inject corruption into scsi_debug
that was posted to the linux-scsi list.

Changes since v1:
 - fix various requirements
 - use _exit
 - cleanup up the scsi_debug options building
 - add a new PI group
 - mark one of the new tests dangerous as it can crash Linux 7.2 and earlier