Implements cta_admin drive up|down

Also minor refactoring for readability

Simplifies option parsing by overloading on the option type (string,
uint64_t or bool). Flags are treated as optional bool options which
are either true or not present in the option list.

and not standard releases.

condition.

This commit should fail in system tests with a core dump on the
frontend.

This completes the dispatcher logic in the frontend

avoid file metadata resolution on eos side.

when SSI is not used.

The probe state is also used. It represents the time when the drive is being checked
for tapes during the down to up transition.

Shutdown is not in use yet as it requires changing the behaviour of the system (clean shutdowns).

We now automatically find all binaries to symlink into /usr/bin of containers.

Changes dispatcher back to using a switch statement for the EOS commands
for easier static analysis.