RFR: 8065748 - Add a test to verify that non ascii characters in Encodings.properties do not cause issues

[Daniel Fuchs]

Hi,

Please find below a small webrev that adds a trivial sanity
test to CheckEncodingPropertiesFile.java

http://cr.openjdk.java.net/~dfuchs/webrev_8065748/webrev.00

This is as a followup of Joel's fix for
https://bugs.openjdk.java.net/browse/JDK-8065138

best regards,

-- daniel