Description of problem:
Open discussion:
What storageClass should the VM use if the default storageClass is different from the dataSource?

Currently in 4.11, the VM is using the default storageClass, but it can cause a performance issue. For example, the storageClass of dataSource is HPP and the default storageClass is OCS, create a VM, the VM disk clone is very slow because the target SC and source SC are different.

So raise the question here, what the storageClass should the VM use?
Suggest solution:
1. if the template has bootsource, the VM SC should align the bootSource, to avoid performance issue.
2. if the template has no bootsource, the VM use the default SC.
3. document this behavior

Version-Release number of selected component (if applicable):
CNV 4.11

How reproducible:
100%

Steps to Reproduce:
1. verify the dataSource SC is HPP
2. modify the default storageClass to OCS
3. create a vm and monitor its status

Actual results:
VM disk importing is very slow, usually takes about 10 minutes

Expected results:
VM disk importing is quickly

Additional info: