Remove many ERROR outputs from non-debug NSE output

scripts/http-devframework.nse

@@ -117,7 +117,7 @@ action = function(host, port)
     -- most of them are "legitimate" and should not be reason to abort
     if (not(status)) then
       if (r.err) then
-        return stdnse.format_output(true, ("ERROR: %s"):format(r.reason))
+        return stdnse.format_output(false, r.reason)
       else
         break
       end