Gyro CLI always exits with '0' even if there's an error.

[sshyub]

Describe the bug
Gyro CLI always exits with '0' even if there's an error.

To Reproduce
Give a wrong credential file in init.gyro, and run gyro up.

Expected behavior
Gyro exited with '1' previously.

Additional context
After gyro cli refactored with picocli, exception is handled by
commandLine.setExecutionExceptionHandler(Gyro::invalidUserInput); in Gyro#init(), which always returns the status code, 2, but then it is even suppressed by Gyro#run().

Fixes should match the exit codes that are declared in the catch clauses in Gyro#main() function.
Also the catch clauses in main should be removed if they are not used any more.