Follow-up to r1540539 after kkolinko review

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1540641 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55760
Remove unnecessary setting of property that causes problems whe using SPNEGO with IBM JDKs.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1540647 13f79535-47bb-0310-9956-ffa450edef68