RFR(S/T) : 8219158 : use 'test.root' property instead of traversing test-src path

[David Holmes]

Hi Igor,

On 20/02/2019 3:54 pm, Igor Ignatyev wrote:
> http://cr.openjdk.java.net/~iignatyev//8219158/webrev.00/index.html
>> 73 lines changed: 9 ins; 32 del; 32 mod;
> 
> Hi all,
> 
> could you please review this trivial clean-up? jtreg4.2-b14 added a new property 'test.root', this patches replaces all code in hotspot testbase which determines the root directory w/ simple reading of this property.

You will have to update the jtreg requiresVersion to b14 to use this, 
else it will fail for anyone not using b14.

Thanks,
David
----

> JBS: https://bugs.openjdk.java.net/browse/JDK-8219158
> webrev: http://cr.openjdk.java.net/~iignatyev//8219158/webrev.00/index.html
> testing: vmTestbase/gc/g1/unloading, vmTestbase/nsk/monitoring/stress, vmTestbase/vm/mlvm/, vmTestbase/vm/runtime/defmeth
> 
> Thanks,
> -- Igor
>