jmod enhancements to support signed modules

[Dalibor Topic]

Vincent Ryan wrote:
> Thanks for your comments Sean.
> 
> I've made the changes you suggest except for removing PKCS7VerifierParameters
> class because it is used by the ModuleFormatTest01 unit test.
> 
> An updated webrev is available at:
> 
> http://cr.openjdk.java.net/~vinnie/6957907/webrev.01/

Looks good to me, small nits:

ModuleFileFormat:

* import cleanup: 

I guess the  import java.security.cert.Certificate; could go away, too?

* loadCACertsStore:

Not sure about the unix file separators and the file location on windows
- if the file name is used across tests & further code, it may make sense
to add it to Files.java.

* SimpleLibrary

indentation : 
+            if (doVerify) {
             mr.verifyHashes();
+            }

cheers,
dalibor topic

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