Review request for warnings cleanup: some i18n classes in java.util and sun.util

[Masayoshi Okutsu]

Here are warnings cleanup fixes for some of the i18n classes in 
java.util and sun.util.**.

http://cr.openjdk.java.net/~okutsu/8/7117487/webrev.00/

I made some more cleanup suggested by NetBeans (unused imports, private 
final, etc.) in addition to the standard compiler warnings cleanup.

Thanks,
Masayoshi