PR Summary

Move away from the local cache files to the Az CLI metadata service

• Use a single HttpClient instance for all requests sent from the Azure agent.
• Replace the local cache files with the AzCLI metadata service for static argument values.
  • the timeout for querying the metadata service is set to 1.2 seconds
  • proceed to Az CLI tab completion for dynamic values only if the parameter has completer or if the metadata for the parameter is unavailable