Review for JDK-8132527

[Jean-Francois Denise]

Hi,
asking for review to fix jvm crashing when replacing jimage file with recreated one.

The name of the module metadata resource was wrongly associated to the name of the recreated jimage file. The original name must be reused in the recreated jimage.
This is what this fix is doing. In addition the jimage unit test has been extended to cover the case where the provided jimage path is relative.

http://cr.openjdk.java.net/~jfdenise/8132527/

Thanks.
JF