vSphere Problem Detector Operator fails with permissions checks in OpenShift 4

Issue

• Frequently receiving health checks warning for CheckAccountPermissions, CheckComputeClusterPermissions, CheckFolderPermissions and CheckDefaultDatastore.

• In the logs of the vsphere-problem-detector-operator pod, in namespace openshift-cluster-storage-operator, messages like the following ones can be seen:

  CheckAccountPermissions failed: missing privileges for vcenter: Cns.Searchable, Sessions.ValidateSession, StorageProfile.Update, StorageProfile.View
  failed to run checks: missing privileges for vcenter: Cns.Searchable, Sessions.ValidateSession, StorageProfile.Update, StorageProfile.View
  

  error getting datastore DXX: failed to access datastore DXX: datastore 'DXX' not found
  CheckDefaultDatastore failed: defaultDatastore "DXX" in vSphere configuration: failed to access datastore DXX: datastore 'DXX' not found
  CheckFolderPermissions failed: failed to access DXXXX: failed to access DXXXX: datastore 'DXX' not found