RFR 8068687: Remove meta-index support and cleanup hotspot code for rt.jar etc in non-modular jdk image

[harold seigel]

Hi,

Please review this fix for bug 8068687.  The fix removes the code that 
implements meta-index support and rt.jar related processing, because 
this code is no longer used.  Removing meta-index support may allow 
removal of LazyClassPathEntry support.  I will look into that in a 
separate bug.

Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8068687_metaindex/

JBS bug: https://bugs.openjdk.java.net/browse/JDK-8068687

I tested the fix with JCK lang, vm, and api tests, hotspot jtreg tests, 
and nsk quick tests.

Thanks! Harold