[mod_status] display HTTP/2 control stream w/ reqs
[mod_status] display HTTP/2 control stream w/ reqs

display HTTP/2 control stream as pseudo-request in request list

HTTP/2 control stream has URI "*" from "PRI *" HTTP/2 connection preface

lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,gstrauss/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4,lighttpd/lighttpd1.4