revert: don't tear down talk thread when cache goes into read-only mode
revert: don't tear down talk thread when cache goes into read-only mode

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