BZ 56661: Fix Servlet API getLocalAddr().

Use new custom request attribute "AJP_LOCAL_ADDR"
forwarded by the next mod_jk 1.2.41 to set the local
IP address returned by getLocalAddr():

Before this change Tomcat handled getLocalAddr() like
getLocalName().

Needs some testing before backport.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1609593 13f79535-47bb-0310-9956-ffa450edef68