qemu: don't log failure during QMP add-fd probe
qemu: don't log failure during QMP add-fd probe

Otherwise, we get a lot of scary (but harmless) noise in the logs:

2013-02-05 15:35:48.555+0000: 8637: error : qemuMonitorJSONCheckError:353 : internal error unable to execute QEMU command 'add-fd': Parameter 'fdset-id' expects an existing fdset-id

one for every qemu 1.2 binary that we probe.

* src/qemu/qemu_monitor_json.c (qemuMonitorJSONAddFd): During
probe, avoid logging failures.

olafhering/libvirt,jardasgit/libvirt,rlaager/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,datto/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,trainstack/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,fabianfreyer/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,elmarco/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,nertpinx/libvirt,zippy2/libvirt,taget/libvirt,agx/libvirt,rlaager/libvirt,jfehlig/libvirt,rlaager/libvirt,jfehlig/libvirt,iam-TJ/libvirt,siboulet/libvirt-openvz,jfehlig/libvirt,datto/libvirt,cbosdo/libvirt,shugaoye/libvirt,eskultety/libvirt,trainstack/libvirt,agx/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,siboulet/libvirt-openvz,crobinso/libvirt,agx/libvirt,trainstack/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,cbosdo/libvirt,andreabolognani/libvirt,eskultety/libvirt,datto/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,shugaoye/libvirt,libvirt/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,iam-TJ/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jardasgit/libvirt,cbosdo/libvirt,agx/libvirt,crobinso/libvirt,elmarco/libvirt,zippy2/libvirt,eskultety/libvirt,eskultety/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,fabianfreyer/libvirt,taget/libvirt,rlaager/libvirt,iam-TJ/libvirt,trainstack/libvirt,elmarco/libvirt,elmarco/libvirt,jfehlig/libvirt,crobinso/libvirt,trainstack/libvirt,shugaoye/libvirt,agx/libvirt,olafhering/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,iam-TJ/libvirt,siboulet/libvirt-openvz,jardasgit/libvirt,libvirt/libvirt,datto/libvirt,shugaoye/libvirt,shugaoye/libvirt,taget/libvirt,datto/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,libvirt/libvirt,taget/libvirt,iam-TJ/libvirt,zippy2/libvirt,crobinso/libvirt,VenkatDatta/libvirt,trainstack/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt