--no-wait for async call on CreateSiteUsers

[jacalata]

Applies to CreateUsers and CreateSiteUsers: --no-wait By default, this command creates users using a synchronous operation (it waits for all operations to complete before proceeding). You can use the --no-wait option to specify an asynchronous operation

--silent-progress Do not display progress messages for the command. (Check: I assume this is meaningless if --no-wait is specified)