<i18n dev> [15] RFR: 8245241: Incorrect locale provider preference is not logged

[naoto.sato at oracle.com]

Hello,

Please review the fix to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8245241

The proposed changeset is located at:

https://cr.openjdk.java.net/~naoto/8245241/webrev.00/

Incorrect user-provided provider preference is supposed to be logged. 
However it is not so because it is using PlatformLogger(SurrogateLogger) 
which uses the default logging level. I changed it to use j.l.System's 
logger and bumped it to INFO level (it should notify the user by 
default). By taking this opportunity, I did some clean-up in locale 
provider adapter's logging related code as well.

Naoto