max_simultaneous doesn't apply to aws calls

[devopsrick]

It seems like max_simultaneous isn't honored when it comes to aws calls.

I'm using machine_batch to set up hosts on aws and it seems like the call to aws fires off to create all the hosts at once, then the subsequent chef converge runs are correctly bounded by max_simultaneous.

This is an issue because I frequently run into RequestLimitExceeded errors and have to go back and split up my machine_batch into smaller groups to get around this.