8153716: JShell tool: should warn when failed to launch editor Summary: Catch launch exceptions. Split ToolBasicTest into two to provide place for regression test. Reviewed-by: rfield Contributed-by: kubota.yuji@gmail.com

^build/
^dist/
nbproject/private/
^webrev
^.hgtip
^.bridge2
^.jib/
.DS_Store
.metadata/
.recommenders/