code review request: 8009752: Let SCDynamicStoreConfig return raw info

[Weijun Wang]

Please review the code changes at

   http://cr.openjdk.java.net/~weijun/8009752/webrev.00/

On OS X we use SCDynamicStoreConfig to read krb5.conf-like info. 
Currently the native method in SCDynamicStoreConfig.m returns a data 
structure that mimics the internal data structure inside 
sun/security/krb5/Config.java. If we decide to refactor Config to 
support more features (for example, 7153718) and the data structure 
needs to be adjusted, SCDynamicStoreConfig.m must be updated also.

This code change includes:

1. Modify SCDynamicStoreConfig.m so that getConfig0(key) can read 
anything inside SCDynamicStore (just like a "list key" call in scutil), 
and the output is the raw structure inside the store.

2. Convert these info to Config-style inside SCDynamicStoreConfig.java. 
If we want to modify Config internal data in the future, we just need to 
update SCDynamicStoreConfig.java. No more native codes will be touched.

A regression test is provided to partially test the correctness of 
conversion in the java part. A real test on Mac OS X server will be 
needed to fully test the code changes. I've personally checked in on my 
own machine.

Thanks
Max