Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54712
Code clean-up. Use Locale.ENGLISH consistently for upper/lower case conversions.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1457453 13f79535-47bb-0310-9956-ffa450edef68