[rfc][icedtea-web] RH976833 ClassLoader deadlock

[Andrew Azores]

Changelog:

* netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java: (loadClass) 
made unsynchronized.
(available, jarIndexes, classpaths, jarEntries, jarLocationSecurityMap) 
wrapped in synchronized classes.

An earlier change to the classloader made it possible for two threads to 
enter deadlock. This is resolved by not giving the thread which calls 
loadClass the lock on the JNLPClassLoader instance, and instead 
synchronizing the member variables which are accessed in loadClass and 
other methods called by loadClasss.

Also made some for-loops into for-each-loops for readability.

Thanks,

-- 
Andrew A

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