[9] RFR 8135114: sun/security/krb5/auto tests failed for tr locale.

[Artem Kosarev]

Could you please review the proposed fix for regression tests
BUGURL: https://bugs.openjdk.java.net/browse/JDK-8135114
WEBREV: http://cr.openjdk.java.net/~akosarev/8135114/webrev.00 
<http://cr.openjdk.java.net/%7Eakosarev/8135114/webrev.00>

DESCRIPTION:
**toLowerCase & toUpperCase methods were used without Locale specification.
    This resulted in incorrect conversion for some of the Locales (i.e. 
tr_TR.UTF-8).

Changes were successfully tested with JPRT.

Best regards,
Artem Kosarev.