RFR: JDK-8207243: Fix translation filtering to also support zh_HK and zh_TW

[Erik Joelsson]

The zh_HK translation is mostly generated by copying the zh_TW 
translation. Because of this, there are different types of rules defined 
for generating those and the recently added filtering mechanism won't 
work for it. This patch fixes that as well as adds those translations to 
the Oracle filter list. It also further modifies the 
logging/LocalizedLevelName test to only use translations provided by Oracle.

Webrev: http://cr.openjdk.java.net/~erikj/8207243/webrev.01/index.html

Bug: https://bugs.openjdk.java.net/browse/JDK-8207243

/Erik