Fix logic where sendfile thread could get stuck in infinite loop on connector stop.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1523955 13f79535-47bb-0310-9956-ffa450edef68
Fixed realm documentation - the number of the standard o.a.catalina.Realm implementations provided by Tomcat was not correct. Issue was reported through comments.apache.org.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1523958 13f79535-47bb-0310-9956-ffa450edef68