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Using multi scenarios to generate load
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Use Case
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Rally should be able to generate real life load. Simultaneously create load
on different components of OpenStack, e.g. simultaneously booting VM, uploading
image and listing users.


Problem Description
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At the moment Rally is able to run only 1 scenario per subtask.
Scenario are quite specific (e.g. boot and delete VM for example) and can't
actually generate real life load.

Writing a lot of specific subtask scenarios that produces more real life
load will produce mess and a lot of duplication of code.


Possible solution
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* Extend Rally subtask configuration in such way to support passing
  multiple scenarios in single subtask context

* Extend Rally task output format to support results of multiple scenarios in
  single subtask separately.

* Extend rally task plot2html and rally task detailed to show results
  separately for every scenario.
