Remove fields "context" and "wrapper" and their setters from Catalina Request object.
This information is available from MappingData object.

A pair of (context == null) checks removed, as such checks are already done earlier in the same method.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1604472 13f79535-47bb-0310-9956-ffa450edef68