RFR: 8153317: Two jimage tests have been failing since JDK-8152641 was fixed

[Claes Redestad]

Hi,

seems my recent push for JDK-8152641 broke a jimage test or two.

While I think these test seem a bit odd, it's apparent that checking 
that we're not adding the same resource twice is enough to make the 
tests happy for now:

Webrev: http://cr.openjdk.java.net/~redestad/8153317/webrev.01/
Bug: https://bugs.openjdk.java.net/browse/JDK-8153317

Thanks!

/Claes