8154149: tools/javac/unit/T6198196.java broken on Windows after JDK-8150641
Summary: Avoiding interference among sub-tests due to CacheFSInfo by using a new file manager for each sub-test
Reviewed-by: jjg
8150641: Repeated compilation with a long classpath significantly slower on JDK 9
Summary: Caching resolved zip paths, and their non-existence; introducing an abstraction over jrtfs, directory and zipfs.
Reviewed-by: jjg