* Use a separate subpool to manage the data for the socket and the connection

  member of the proxy_conn_rec struct as we destroy this data more frequently
  than other data in the proxy_conn_rec struct like hostname and addr (at least
  in the case where we have keepalive connections that timed out and were
  closed by the backend).
  This fixes a memory leak with short lived and broken connections.

PR: 44026


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@603237 13f79535-47bb-0310-9956-ffa450edef68