Prepend host to Listen directive in httpd.conf for CTest (#377)

To follow up on #374

Author: hummeltech

tests/httpd.conf.in

@@ -73,8 +73,8 @@ Redirect /renderd-example-map/leaflet/leaflet.min.js https://unpkg.com/leaflet/d
 CustomLog @HTTPD_LOG_ACCESS@ "%h %l %u %t \"%r\" %>s %b"
 ErrorLog @HTTPD_LOG_ERROR@
 Group @WWW_GROUP_NAME@
-Listen @HTTPD0_PORT@
-Listen @HTTPD1_PORT@
+Listen @HTTPD0_HOST@:@HTTPD0_PORT@
+Listen @HTTPD1_HOST@:@HTTPD1_PORT@
 LogLevel debug
 PidFile @HTTPD_PID@
 ServerName localhost