Pipeline fixes (MSI)

[vilit1]

MSI pipeline fix (install packages on correct python version) addition of some sleeps into storage tests to improve performance.

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[vilit1]

https://dev.azure.com/azureiotdevxp/aziotcli/_build/results?buildId=5930&view=results - py 37

[digimaun]

For future reference, you just need to have an IOT_CLI_ADU_ENABLED=1 var setup in your var group to avoid the device-update not found errors in smoke tests.