[lib-common] increase docker log speed. #752

Job	Run time
shellcheck	9s
shellcheck	9s
Test script (gantry_cleanup_images_spec.sh)	1m 14s
Test script (gantry_cleanup_images_spec.sh)	1m 14s
Test script (gantry_common_options_spec.sh)	1m 3s
Test script (gantry_common_options_spec.sh)	1m 3s
Test script (gantry_filters_spec.sh)	52s
Test script (gantry_filters_spec.sh)	52s
Test script (gantry_jobs_spec.sh)	18s
Test script (gantry_jobs_spec.sh)	51s
Test script (gantry_login_docker_config_spec.sh)	56s
Test script (gantry_login_docker_config_spec.sh)	56s
Test script (gantry_login_negative_spec.sh)	1m 18s
Test script (gantry_login_negative_spec.sh)	1m 18s
Test script (gantry_login_spec.sh)	1m 0s
Test script (gantry_login_spec.sh)	1m 0s
Test script (gantry_manifest_spec.sh)	57s
Test script (gantry_manifest_spec.sh)	57s
Test script (gantry_notify_spec.sh)	1m 30s
Test script (gantry_notify_spec.sh)	1m 30s
Test script (gantry_parallel_spec.sh)	1m 0s
Test script (gantry_parallel_spec.sh)	1m 0s
Test script (gantry_rollback_spec.sh)	47s
Test script (gantry_rollback_spec.sh)	47s
Test script (gantry_service_multiple_spec.sh)	37s
Test script (gantry_service_multiple_spec.sh)	37s
Test script (gantry_service_no_running_tasks_spec.sh)	52s
Test script (gantry_service_no_running_tasks_spec.sh)	52s
Test script (gantry_service_single_spec.sh)	49s
Test script (gantry_service_single_spec.sh)	49s
Test script (gantry_update_options_spec.sh)	1m 2s
Test script (gantry_update_options_spec.sh)	1m 2s
Build and push Docker image	0s
Build and push Docker image	1m 23s
Test container	0s
Test container	2m 5s
	32m 49s

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