Support per-testcase directories in all test suites

There are cases where two modules try to install the same test data
into CTS, which results in collisions when CTS puts the data for all
tests in the same directory.  Add a flag that allows enabling a
per-testcase directory for an individual test for all test suites.

Bug: 193168159
Test: cts-tradefed run commandAndExit CtsBionicTestCases
Change-Id: I4bfaaedfe0e6b8df9c75125b3e2762a4f0d5b395