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

8005282: Use @library tag with non-relative path for javac tests
Reviewed-by: jjg

6930508: Passing nested class names on javac command line interfere with subsequent name -> class lookup
Reviewed-by: darcy