append chart server related config options to the supporting list of adminserver
provide chart server related config access method in the API layer
update prepare script and ui env template file to enable cache driver config for chart server API
append flag info in the systeminfo API to indicate if chart server is deployed with Harbor
refactor the response rewriting logic to return structual error object
add api init method to initilizing objects required in API handlers
chage owner of the storage folder
update offline/online package scripts in Harbor-Util.robot
By default Harbor will call catalog API of registry and sync the result to DB, this becomes problematic when registry is configured to custom storage service, there maybe inconsistent result and the whole process may be very time consuming.
So in this commit a env var SYNC_REGISTRY is introduced if user want Harbor to sync the repo when it starts up, by default it's false.
