Bug 369956: Have testserver.pl report whether or not the server is using mod_perl

r=mkanat, a=justdave

webtools/bugzilla/testagent.cgi

@@ -19,6 +19,6 @@
 
 use strict;
 print "content-type:text/plain\n\n";
-print "OK\n";
+print "OK " . ($::ENV{MOD_PERL} || "mod_cgi") . "\n";
 exit;
 

webtools/bugzilla/testserver.pl

@@ -107,8 +107,8 @@ Check your webserver configuration and try again.\n";
 
 # Try to execute a cgi script
 my $response = fetch($ARGV[0] . "/testagent.cgi");
-if ($response =~ /^OK/) {
-    print "TEST-OK Webserver is executing CGIs.\n";
+if ($response =~ /^OK (.*)$/) {
+    print "TEST-OK Webserver is executing CGIs via $1.\n";
 } elsif ($response =~ /^#!/) {
     print 
 "TEST-FAILED Webserver is fetching rather than executing CGI files.