Revert r1601943, r1602058, r1605307 (socket callback returning pollfds)

Revert r1605369 (wstunnel refactoring)

per discassion on dev@httpd.a.o thread Message-ID:
<CALK=YjN9HfThP_k_rF9iJPcUhcQk9sNOaDPxZNG+HcJNWS4ZAQ@mail.gmail.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1605946 13f79535-47bb-0310-9956-ffa450edef68