scheduler: Clean up failed IPP Everywhere permanent queues

[zdohnal]

If creating of permanent queue with IPP Everywhere model fails in separate thread, the print queue is created as raw.

It would be great if we remove such queue if creation fails, and marking them as temporary would make them to be removed automatically.

[michaelrsweet]

LGTM

[zdohnal]

@michaelrsweet I've missed one:

 5377     if ((from = cupsFileOpen(fromppd, "r")) == NULL)
 5378     {
 5379       cupsdLogMessage(CUPSD_LOG_ERROR, "%s: Unable to read generated PPD: %s", printer->name, strerror(errno));
 5380 
 5381       /* Force printer to timeout and be deleted */
 5382       cupsRWLockWrite(&printer->lock);
 5383       printer->state_time = 0;
 5384       cupsRWUnlock(&printer->lock);

since the logic is the same, I'll commit the change directly.