RFR: 8152143: jlink --include-locales should gracefully detect certain user error

[Naoto Sato]

Hello,

Please review the fix to the following bug:

https://bugs.openjdk.java.net/browse/JDK-8152143

The fix is located at:

http://cr.openjdk.java.net/~naoto/8152143/webrev.02/

Naoto