[2087981] PowerOnVM_Task is deprecated use PowerOnMultiVM_Task for DRS ClusterRecommendation

Description of problem:

Sometimes we see VMs fail to power on when the land on a host that does not have enough resources. The current power on does not retry or leverage DRS to power on the node on a suitable host.

https://github.com/vmware/govmomi/issues/1026

Our code is still making calls to PowerOnVM_Task which, according to the vsphere docs, is deprecated and we should use PowerOnMultiVM_Task instead.

PowerOnVM_Task does not return a DRS ClusterRecommendation, no vmotion nor host power operations will be done as part of a DRS-facilitated power on. To have DRS consider such operations use PowerOnMultiVM_Task.

https://vdc-download.vmware.com/vmwb-repository/dcr-public/b50dcbbf-051d-4204-a3e7-e1b618c1e384/538cf2ec-b34f-4bae-a332-3820ef9e7773/vim.VirtualMachine.html#powerOn:
As of vSphere API 5.1, use of this method with vCenter Server is deprecated; use PowerOnMultiVM_Task instead.

Version-Release number of selected component (if applicable):
4.8.x

How reproducible:
Always

Steps to Reproduce:
1.
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Actual results:
Sometimes powers on fails requiring manual intervention.

Expected results:
PowerOn should use DRS to ensure it's always successful.

Additional info: