Partial fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=55620
Handle the case of a comma in $CATALINA_HOME or $CATALINA_BASE

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1529816 13f79535-47bb-0310-9956-ffa450edef68