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

8076543: Add @modules as needed to the langtools tests
Reviewed-by: jjg, shurailine

8062348: langtools tests should close file manager (group 1)
Reviewed-by: darcy

6943119: Rebrand source copyright notices
Reviewed-by: darcy

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