8133671: langtools tests have bad license
Summary: Dropped classpath exception from copyright notice in tests.
Reviewed-by: jjg

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

6943119: Rebrand source copyright notices
Reviewed-by: darcy

6668802: javac handles diagnostics for last line badly, if line not terminated by newline
Summary: use CharBuffer.limit(), not the length of the backing array
Reviewed-by: mcimadamore