Small refactoring in searching for attributes

[Jiri Vanek]

This patch is starting reaction to u45 -  http://www.java.com/en/download/faq/release_changes.xml
I have extracted methods which were searching for main class attribute, and I'm going to use those 
methods in future, when searching for Application-Name, Caller-Allowable-Codebase and 
Application-Library-Allowable-Codebase.


Please note, this have to go also to 1.4, and that tests are already included n itw.

Any thoughts?


Thanx, J.
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