title: Robot Framework - Execute tests on multiple environments in parallel
body: <p>I got a projet that running on multiple environnement en production. So I got an identical test environment like the production.</p>
  <p>I need to execute my RobotFramework tests on each of this test environnement, in parralel.
  So my needs is to do these 3 task in parralel with only 1 execution, in parallel to not waste time..</p>
  <p><code>robot -d rapport -v env:UAT1 tests/</code></p>
  <p><code>robot -d rapport -v env:UAT2 tests/</code></p>
  <p><code>robot -d rapport -v env:UAT3 tests/</code></p>
  <p>I tried to use --argumentfile to do it, in each of them I added env:UAT1, env:UAT2, env:UAT3. It should execute the tests for each argumentfile but it doesnt work :</p>
  <p><code>robot -d rapport --argumentfile UAT1.args --argumentfile UAT2.args --argumentfile UAT3.args tests/</code></p>
  <p>I tried pabot but it doesnt seems to work too...</p>