make sure the writer thread is properly joined un AbstractUploader
make sure the writer thread is properly joined un AbstractUploader

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