change whitelist marker for PKCS7 verification to Vpkcs7
change whitelist marker for PKCS7 verification to Vpkcs7

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