[cta-admin] Cleaned cta-admin deprecated methods and remove fields for...

[cta-admin] Cleaned cta-admin deprecated methods and remove fields for cta-admin --json output of the commands that were modified by CTA v4.0

- cta-admin --json sq showqueues does not show maxdrives anymore but read/write max drives
- cta-admin --json showqueues does not display the next mounts, empty tapes, readonly tapes and disabled tapes anymore
- cta-admin --json mountpolicy ls does not display the old maxDrivesAllowed parameter anymore
- cta-admin --json tapefile ls does not display supersededByVid and supersededByFseq anymore