fixed double inserts with existing hardlink group members
fixed double inserts with existing hardlink group members

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