Parse multiple authorizations and DNs.
Parse multiple authorizations and DNs.

As a bit of future-proofing, make sure we parse and check against
multiple authorizations, in case if they're present.  Additionally,
check for a specific user DN.

I purposely do not expose the multiple authorizations on the server side;
I simply want the clientside done for forward compatibility.

alhowaidi/cvmfsNDN,reneme/cvmfs,djw8605/cvmfs,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,djw8605/cvmfs,DrDaveD/cvmfs,trshaffer/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,reneme/cvmfs,reneme/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,trshaffer/cvmfs,reneme/cvmfs,alhowaidi/cvmfsNDN,alhowaidi/cvmfsNDN,DrDaveD/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,Moliholy/cvmfs,trshaffer/cvmfs,cvmfs/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,Gangbiao/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,reneme/cvmfs,cvmfs/cvmfs,djw8605/cvmfs,Gangbiao/cvmfs,DrDaveD/cvmfs,Moliholy/cvmfs,cvmfs/cvmfs,Gangbiao/cvmfs,alhowaidi/cvmfsNDN,djw8605/cvmfs,trshaffer/cvmfs