Removed unnecessary require statement from vm_vapp_property type
Renamed datacenter_name property to datacenter for vm_vapp_property
VM vApp Property Updates
-Change property names to be more in line with standards
-Removed static getting and setting methods for properties and replaced them with dynamically generated methods.
vm_vapp_property => changes to automatically set the label to the namevar value
vm_vapp_property => removed should because it was causing changes to occur twice. Replaced with simplier update flag that changed thing back a single call
vm_vapp_property tests => updated tests now that namevar is working properly