Review request (XXS): Remove the temporary hack added for jdk modularization

[Mandy Chung]

  7025628: Remove the temporary hack added for jdk modularization in hotspot

Webrev:
    http://cr.openjdk.java.net/~mchung/7025628/webrev.00/

A temporary hack that adds a boot module (jdk.boot.jar) in the bootclasspath
was added in JDK 7 hotspot for jdk modularization.  As jdk modularity is
now targetted to JDK 8, this fix is to remove this hack.

Thanks
Mandy