Backports:

Correct behavior of HTTP request headers sent by ab in presence of -H command-
line overrides.  Previously, ab would concatenate a supplied -H User-Agent: 
header to the existing one, and send duplicate headers if either -H Host: or
-H Accept: were specified on the command line. 

Now, the default headers are not sent if they are overridden using the -H 
command-line flag. 

Submitted by:  Arvind Srinivasan arvind.srinivasan  sun.com
Reviewed by: sctemme
PR: 31268, 26554

The apr_port_t type is unsigned, but ab was using a signed format code in
its reports. PR 42070. Submitted by Takashi Sato serai  lans-tv.com, 
reviewed by sctemme.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@534057 13f79535-47bb-0310-9956-ffa450edef68