RFR: JDK-8233244: Add tests for icons configuration in rpm/deb packages

[Andy Herrick]

looks good.

/Andy

On 6/10/2020 1:04 PM, Alexey Semenyuk wrote:
> Please review fix [2] for jpackage bug [1].
>
> The fix adds verification there are `xdg-icon-resource` commands in 
> Linux packages for file associations with icons.
>
> - Alexey
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8233244
>
> [2] http://cr.openjdk.java.net/~asemenyuk/8233244/webrev.00
>