Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=57105
When parsing web.xml do not limit the buffer element of the jsp-property-group element to integer values as the allowed values are <number>kb or none.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1633447 13f79535-47bb-0310-9956-ffa450edef68