8217329: JTREG: Clean up, remove unused imports in gc folder

[Leonid Mesnik]

Hi

Fix looks good. (I haven't checked manually if removed imports are really used though. Running tests should enough.) Please get also 'R'eview from 'R'eviewer.

Leonid

> On Jan 17, 2019, at 8:58 AM, Leo Korinth <leo.korinth at oracle.com> wrote:
> 
> Hi,
> 
> This fix removes unused imports and newlines in the jtreg/gc folder.
> 
> This fix is somewhat based/dependent on "8214799: Add package declaration to each JTREG test case in the gc folder". That fix is out for review.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8217329
> 
> Webrev:
> http://cr.openjdk.java.net/~lkorinth/8217329/00
> 
> Testing:
> passed locally: open/test/hotspot/jtreg/:hotspot_gc
> 
> Thanks,
> Leo