8140766: langtools/make/test/sym/CreateSymbolsTest.java contains incorrect paths
Summary: Fixing paths in CreateSymbolsTest; fixing imports in CreateSymbolsTestImpl.
Reviewed-by: mcimadamore

8072480: javac should support compilation for a specific platform version
Summary: Adding a new javac option for compiling for JDK N: -release N; including history data for previous version of JDK.
Reviewed-by: erikj, ihse, jjg, mcimadamore, mr
Contributed-by: jan.lahoda@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com