fix number extraction in check_memory
fix number extraction in check_memory

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