[Feature Request] Parallel InnerTestClassesSuite

[steplica]

Both ParallelSuite and InnerTestClassesSuite are very useful, but I would love to see an option like ParallelInnerTestClassesSuite that automatically discovers inner test classes and runs them all in parallel.

The current way to accomplish this is manually setting a SuiteClasses annotation to point to each inner class, and running that test class with ParallelSuite.