[test] instantiate ScanPrivilegeVirtualColumnsTest

Before this patch, the ScanPrivilegeVirtualColumnsTest suite was not
instantiated, so no tests from the parameterized suite were run.  This
patch adds the missing instantiation, so now the tests are run.

This is a follow-up to 66f4bb136e1bc42e8c031548b56ee1927002ac09.

Change-Id: Id60acd02f22a9ed617c590d8cf0387a366ddc0b1
Reviewed-on: http://gerrit.cloudera.org:8080/18921
Tested-by: Kudu Jenkins
Reviewed-by: Yingchun Lai <acelyc1112009@gmail.com>
1 file changed