and generating all the required krb5 keytabs

adding all the missing bits to allow the simple systemtest to run on the client pod:
- add user `daemon` to sudoer in eos so that we can xrdfs prepare as a `powerusers` user
- add the `powerusers` group mount rule in cta
- add the missing bits in client_test.sh

to allow all users with ctausers as their primary group to mount tapes. the uid-gid mapping is performed by the mgm

2 tapeservers are now available: tpsrv01 and tpsrv02.
systest.sh only put tpsrv01 up and perform the basic test on 1 drive only.

Removed the "--encryptionkey" option from "cta tape add"

Now `run_systemtest.sh` can be used standalone, outside of CI environment.

Waiting for library configuration. If missing it leads to failed test: no drive tape or library available...