CTA-Taped should exit on failure to read sss keytab

Problem to solve

As discovered in this community ticket created by Mwai, if the drive process fails to open the sss kt in the creation process, it will be killed in a non critical way and it will recreated, failing agains, into an infinite loop, without a clear reason about what is hapenning.

Stakeholders

• CTA Dev Team

Proposal

CTA-Taped should exit in this scenario as a basic configuration file is missing. And, the check for the right permissions should be moved to the creation of the daemon.