docker/machine: add sleep between machine creation
What does this MR do?
In docker+machine executor two options added, config the concurrency in machine creation and sleep between creations.
Why was this MR needed?
The default machine creation in docker+machine executor try to create all machines at same time, for example if we have IdelCount = 50 the runner will create 50 machines instantly at the same time; this behavior will cause some problems like API rate limits and huge load on infrastructure to create multiple instance/virtualmachine concurrently.
What's the best way to test this MR?
I have tested this MR on our enviroment, but I think you can test it with any of docker-machine drivers.
What are the relevant issue numbers?
Edited by Parsa Yousefi