Add device limits stress testing to have numbers used later in production or alarming when approaching limits.

[tugrul512bit]

OpenCL can't get max number of command-queues. Add a test that creates command queues up to 1024, until it gives out of memory or out of resources error, save the value for device so it knows max crunchers in flight, release all resources.

OpenCL can't get max number of buffers neighter. Add a test of it too. So user can get a log about remaining resources before using more.