Non-blocking Servlet 3.1 reads for APR

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1480963 13f79535-47bb-0310-9956-ffa450edef68
Tomcat 8 implements Servlet 3.1

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1480964 13f79535-47bb-0310-9956-ffa450edef68