Add Vm#update_storage_profile integ test
Add Vm#update_storage_profile integ test

If storage profiles are available, switch the Vm from the default
storage profile to a new storage profile.

Allow for marking the test as pending if storage profiles are not
available, by setting the new storage profile to be the same as
the default one.

UKHomeOffice/vcloud-core,gds-operations/vcloud-core,gds-operations/vcloud-core,UKHomeOffice/vcloud-core