fix nested locking problem in lookuppath
fix nested locking problem in lookuppath

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