[APIC-238] Make CLI exit code nonzero when response status code != 2xx

[hinnefe2]

When using the python API client CLI tool a command which fails can still exit with a 0 exit code. This can lead Platform to mark jobs which didn't successfully complete with a green checkmark or to mistakenly progress workflows when a step didn't work.

MWE: Running

civis tables post-scan some_db_id some_schema some_table

Generates logs:

2020-05-05 04:14:37 PM code: 404
2020-05-05 04:14:37 PM error: not_found
2020-05-05 04:14:37 PM errorDescription: The requested resource could not be found.

But the job is still marked as successful.

[WillRaphaelson]

nice