[docs][tests] clarify documents about authentication and filter. Test… #873

Job	Run time
Test container	3m 10s
shellcheck	8s
Test scripts (gantry_cleanup_images_spec.sh)	1m 0s
Test scripts (gantry_common_options_spec.sh)	1m 7s
Test scripts (gantry_filters_spec.sh)	1m 0s
Test scripts (gantry_jobs_spec.sh)	42s
Test scripts (gantry_login_docker_config_spec.sh)	52s
Test scripts (gantry_login_negative_spec.sh)	1m 12s
Test scripts (gantry_login_spec.sh)	58s
Test scripts (gantry_manifest_spec.sh)	58s
Test scripts (gantry_notify_spec.sh)	1m 17s
Test scripts (gantry_parallel_spec.sh)	1m 0s
Test scripts (gantry_rollback_spec.sh)	45s
Test scripts (gantry_service_multiple_spec.sh)	29s
Test scripts (gantry_service_no_running_tasks_spec.sh)	59s
Test scripts (gantry_service_single_spec.sh)	55s
Test scripts (gantry_update_options_spec.sh)	1m 4s
Build and push Docker image	0s
	17m 36s

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