VM fix for booting from a module

[Mandy Chung]

Karen, Mark,

I found two issues with the VM change for booting from a module.
1. sun.java.launcher.module.boot property added to the system property 
list but the memory is already freed.
2. resource path for the boot module in the bootclasspath was incorrect

Webrev at:
   http://cr.openjdk.java.net/~mchung/jigsaw/hotspot-boot-fix/

Apparently, the memory problem caused by (1) only showed up in few 
linux-i586 machines but not all.  Surprisingly, it didn't show up on 
solaris i586, windows, and linux-amd64 (at least on the machines I ran 
the tests).

Can you review it?

Thanks
Mandy