added env variables to skip caching info imageInfo.json, added env var to override baseInfoUrl.
added env variables to skip caching info imageInfo.json, added env var to override baseInfoUrl.

mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient,mlilback/rc2SwiftClient