8237182(T): Update copyright header for shenandoah and epsilon files

[Igor Ignatyev]

Hi Mikael,

LGTM
-- Igor

> On Jan 14, 2020, at 4:18 PM, Mikael Vidstedt <mikael.vidstedt at oracle.com> wrote:
> 
> 
> Please review this small change which adjusts the copyright headers for shenandoah and epsilon related files.
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8237182 <https://bugs.openjdk.java.net/browse/JDK-8237182>
> webrev: http://cr.openjdk.java.net/~mikael/webrevs/8237182/webrev.00/open/webrev/ <http://cr.openjdk.java.net/~mikael/webrevs/8237182/webrev.00/open/webrev/>
> 
> Description:
> 
> Many/most of the shenandoah and epsilon related files are missing the following line in the copyright header: 
> 
> "DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.”
> 
> This change simply adds that line to the relevant files. In src/hotspot/share/gc/shenandoah/shenandoahNormalMode.cpp there was also a missing empty line before one of the paragraphs in the header.
> 
> Cheers,
> Mikael
>