spark.only.query.files are not being run by ptest

Checked a recent run of Hive QA and it doesn't look like qtests specified in spark.only.query.files are being run.

I think some modifications to ptest config files are required to get this working - e.g. the deployed master-m2.properties file for ptest should contain mainProperties.${spark.only.query.files} in the qFileTest.miniSparkOnYarn.groups.normal key.