[libvirt] ESX: Check if a datastore is accessible before accessing its URL property

[Matthias Bolte]

An inaccessible datastore has no valid URL property.

* src/esx/esx_vi.c: esxVI_LookupDatastoreByName(): check if datastore is
  accessible before accessing its URL property
* src/esx/esx_vmx.c: update to changed datastore properties

PS: This patch has to be applied after the 12er patch series.

Matthias
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