Madhava/fix merge tests (#4947)
Madhava/fix merge tests (#4947)

* Fixing issue with Windows in CI and pytest not available immediately

- See here: https://github.com/OpenMined/PySyft/runs/1603537525

* Removing pytest-benchmark on windows slow tests, prevent fatal exception
OpenMined/PySyft,OpenMined/PySyft,OpenMined/PySyft,OpenMined/PySyft