tests: nginx: Allow POSTs in static files

By default Nginx does not allow POST in static files, which is very
used by the regression test. This is a ugly hack just to make possible
to gather some numbers. Better solution will arrive soon.

tests/regression/nginx/conf/nginx.conf.template

@@ -15,6 +15,7 @@ http {
 		listen [% listen %];
 		server_name localhost;
 		location / {
+			error_page 405 = $uri;
 		}
 	}
 }