Reuse API credentials on the network device for checks

API credentials should be stored once on the network device and automatically used by applicable checks. Configuration packages should continue to specify common thresholds without requiring the entire check configuration to be adjusted for each device.

VMware ESXi and vCenter should also be able to use the usernames and passwords stored on the network device for applicable checks. Common check settings, such as thresholds, should continue to be applied from the configuration package.