* ScaleIO/PowerFlex smoke tests improvements, and some fixes
* Fix test_volumes.py, encrypted volume size check (for powerflex volumes)
* Fix test_over_provisioning.py (over provisioning supported for powerflex)
* Update vm snapshot tests
* Update volume size delta in primary storage resource count for user vm volumes only
The VR volumes resource count for PowerFlex volumes is updated here, resulting in resource count discrepancy
(which is re-calculated through ResourceCountCheckTask later, and skips the VR volumes)
* Fix test_import_unmanage_volumes.py (unsupported for powerflex)
* Fix test_sharedfs_lifecycle.py (volume size check for powerflex)
* Update powerflex.connect.on.demand config default to true
