Adjust to govmomi simulator breaking changes

[dougm]

The simulator.Map package variable has been removed from govmomi. See: vmware/govmomi#3701

The simulator.Map usage had been read-only, so changed to use vim25.Client instead. These tests don't have access to simulator instance Context, so we can't use the in-memory 'model.Map()' as pkg/common/cns-lib/vsphere/virtualmachine_test.go does.

[k8s-ci-robot]

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Test name	Commit	Details	Required	Rerun command
pull-vsphere-csi-driver-unit-test	5b873de	link	true	/test pull-vsphere-csi-driver-unit-test

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