Merge r1367819 from trunk:

initialize the protocol field when manufacturing an apr socket
lest accidential autodata contents leak into the apr_socket_t

(this doesn't address any known problem symptom)

Submitted by: trawick
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1373109 13f79535-47bb-0310-9956-ffa450edef68