util: Quiet the logging if perf file doesn't exist
util: Quiet the logging if perf file doesn't exist

Commit id 'b00d7f29' shifted the opening of the /sys/devices/intel_cqm/type
file from event enable to perf event initialization. If the file did not
exist, then an error would be written to the domain log:

2016-09-06 20:51:21.677+0000: 7310: error : virFileReadAll:1360 : Failed to open file '/sys/devices/intel_cqm/type': No such file or directory

Since the error is now handled in virPerfEventEnable by checking if the
event_attr->attrType == 0 for CMT, MBML, and MBMT events - we can just
use the Quiet API in order to not log the error we're going to throw away.

Additionally, rather than using virReportSystemError, use virReportError
and VIR_ERR_ARGUMENT_UNSUPPORTED in order to signify that support isn't there
for that type of perf event - adjust the error message as well.

libvirt/libvirt,jfehlig/libvirt,nertpinx/libvirt,jardasgit/libvirt,nertpinx/libvirt,nertpinx/libvirt,crobinso/libvirt,olafhering/libvirt,datto/libvirt,olafhering/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,zippy2/libvirt,jardasgit/libvirt,olafhering/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,zippy2/libvirt,datto/libvirt,zippy2/libvirt,VenkatDatta/libvirt,eskultety/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,libvirt/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,datto/libvirt,jardasgit/libvirt,jfehlig/libvirt,taget/libvirt,crobinso/libvirt,nertpinx/libvirt,taget/libvirt,taget/libvirt,jardasgit/libvirt,taget/libvirt,olafhering/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,eskultety/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,taget/libvirt,nertpinx/libvirt,eskultety/libvirt,zippy2/libvirt,andreabolognani/libvirt,datto/libvirt,libvirt/libvirt,datto/libvirt,eskultety/libvirt