RFR 8199756 : Simplify language, country, script, and variant property initialization

[Roger Riggs]

Please review a small simplification of the initialization of System 
properties for
language, country, script, and variant.  Some steps for initializing 
them are unnecessary.
The tests pass; a careful review would be appreciated so as to avoid 
breakage.

Webrev:
  http://cr.openjdk.java.net/~rriggs/webrev-prop-simplify-8199756/
Issue:
  https://bugs.openjdk.java.net/browse/JDK-8199756

Thanks, Roger