RFR: JDK-8242155: Enhance automated macos signing tests

[alexander.matveev at oracle.com]

Hi Andy,

Looks good.

Thanks,
Alexander

On 4/8/20 2:14 PM, Andy Herrick wrote:
> Please review the fix to issue [1] at [2].
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8242155
>
> [2] http://cr.openjdk.java.net/~herrick/8242155/webrev.01/
>
> /Andy
>