[Vmware] Fix for OVF parsing error (#2567)

Author: nvazquez

api/src/com/cloud/agent/api/storage/OVFHelper.java

@@ -113,7 +113,7 @@ public List<DatadiskTO> getOVFVolumeInfo(final String ovfFilePath) {
                 String allocationUnits = disk.getAttribute("ovf:capacityAllocationUnits");
                 od._diskId = disk.getAttribute("ovf:diskId");
                 od._fileRef = disk.getAttribute("ovf:fileRef");
-                od._populatedSize = Long.parseLong(disk.getAttribute("ovf:populatedSize") == null ? "0" : disk.getAttribute("ovf:populatedSize"));
+                od._populatedSize = NumberUtils.toLong(disk.getAttribute("ovf:populatedSize"));
 
                 if ((od._capacity != 0) && (allocationUnits != null)) {