8370846: Support execution of mlvm testing with test thread factory

[lmesnik]

The MainWrapper used test thread factory has generated lambda method. So the AbsentInformationException is expected. The actual source path is not checked.

Tested by run mlvm tests with and without test thread factory.

Also
jdk/test/lib/thread/TestThreadFactory.java
updated to provide TestThreadFactory. isTestThreadFactorySet()
that could be used by tests instead of checking property "test.thread.factory" directly.

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• JDK-8370846: Support execution of mlvm testing with test thread factory (Sub-task - P4)

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