Refactor: option parsing for multiple option sets
Refactor: option parsing for multiple option sets

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