To fix test_get_dss_rp in test_vmware_vmdk.py

The test "test_get_dss_rp" in test_vmware_vmdk.py is not testing
the positive case as intended. Rather, it tests the negative case
(no datastores) which is already covered by
"test_get_dss_rp_without_datastores".

Change-Id: I5b4802e22218217e0338fc721fc0ce1efeaee4f1
Closes-Bug: #1251126
Merge "To fix test_get_dss_rp in test_vmware_vmdk.py"