make sure Spooler objects get torn down gracefully
make sure Spooler objects get torn down gracefully

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