OpenPrinting
Test suite: If holding supported, add a new print job for cancelling
On some quicker machines the print-job operation finishes quicker than we can cancel it in the test - so add job-hold-until job template attribute if the printer supports it, which will hold the job until it is cancelled by the next test.
The next test passes because it has both statuses (correct and error one) as expected, but cupsd generates an additional error in log if the job cancelling fails, which would be more dirty to cover in run-stp-test.sh.
There is a loophole when the error is still generated - if the printer/machine is quick enough to finish the job, but the machine/printer doesn't support job holding at the same time. IMHO the current patch should cover most cases.
Fixes? #155
@michaelrsweet I haven't found out how to make a specific attribute optional, so I've added a new print job with job-hold-until if the printer supports it, and adjusted requests count in run-stp-tests.sh accordingly.
