improve logging of pin failures due to full cache
improve logging of pin failures due to full cache

alhowaidi/cvmfsNDN,trshaffer/cvmfs,cvmfs-testing/cvmfs,reneme/cvmfs,Moliholy/cvmfs,alhowaidi/cvmfsNDN,djw8605/cvmfs,djw8605/cvmfs,MicBrain/cvmfs,Gangbiao/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,cvmfs-testing/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,cvmfs-testing/cvmfs,alhowaidi/cvmfsNDN,MicBrain/cvmfs,reneme/cvmfs,trshaffer/cvmfs,MicBrain/cvmfs,Gangbiao/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,MicBrain/cvmfs,djw8605/cvmfs,cvmfs-testing/cvmfs,Gangbiao/cvmfs,MicBrain/cvmfs,trshaffer/cvmfs,reneme/cvmfs,DrDaveD/cvmfs,cvmfs-testing/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,Moliholy/cvmfs,DrDaveD/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,reneme/cvmfs,djw8605/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,cvmfs/cvmfs,trshaffer/cvmfs,Gangbiao/cvmfs,reneme/cvmfs,cvmfs/cvmfs,trshaffer/cvmfs,DrDaveD/cvmfs,alhowaidi/cvmfsNDN,cvmfs/cvmfs