This method instructs all virtual users to stop tests immediately.
POST: Instruct all virtual users to stop immediately
POST Data Parameters
The response is an object, containing one entry for each engine in the test. For each engine there is a list containing two values: a Boolean value indicating whether the request to stop was processed successfully, and a String containing a message.
"intel.win32.clr4_6.0": [true, "Virtual users instructed to stop immediately"]