[entrypoint] cleanup logs about loading libraries and image remover #559

Job	Run time
shellcheck	6s
Test script (gantry_cleanup_images_spec.sh)	2m 3s
Test script (gantry_common_options_spec.sh)	1m 52s
Test script (gantry_filters_spec.sh)	2m 20s
Test script (gantry_login_negative_spec.sh)	1m 44s
Test script (gantry_login_spec.sh)	2m 2s
Test script (gantry_manifest_spec.sh)	2m 36s
Test script (gantry_notify_spec.sh)	2m 36s
Test script (gantry_parallel_spec.sh)	2m 28s
Test script (gantry_rollback_spec.sh)	2m 21s
Test script (gantry_service_multiple_spec.sh)	1m 42s
Test script (gantry_service_no_running_tasks_spec.sh)	1m 30s
Test script (gantry_service_single_spec.sh)	1m 26s
Test script (gantry_update_options_spec.sh)	2m 31s
Build and push Docker image	1m 22s
Test container	3m 17s
	31m 56s

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