First pass at removing the BIO code. Some unused/unnecessary code remains and will be removed next.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1636618 13f79535-47bb-0310-9956-ffa450edef68
With removal of BIO, all endpoints support polling

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1636631 13f79535-47bb-0310-9956-ffa450edef68