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

7044486: open jdk repos have files with incorrect copyright headers, which can end up in src bundles
Reviewed-by: ohair, trims

6963934: JCCompilationUnit.getImports does not report all imports
Reviewed-by: mcimadamore