refactor testsuite infrastructure

[chu11]

the system of "generate all tests" then "delete tests user isn't interested in" isn't working anymore now that there's a huge growth in permutation of tests (i.e. spark 2.2.0 w/ hadoop 2.6 & 2.7, phoenix 4.13 with hbase 1.1, 1.2, and 1.3). It's taking too long to generate tests.