gantry

• fix a problem that incorrectly reports docker service logs levels.

• fix an error getting config name from a service

Breaking change: Update config name and explicitly check if bool configs are true

• GANTRY_MANIFEST_SKIP_INSPECTION -> GANTRY_MANIFEST_INSPECT
• GANTRY_ROLLBACK_SKIP_ON_FAILURE -> GANTRY_ROLLBACK_ON_FAILURE
• GANTRY_CLEANUP_IMAGES_SKIP -> GANTRY_CLEANUP_IMAGES

• fix a problem that failed to report docker service inspect error.

Initial release