Omit deck check warnings on non-root processes

opm/autodiff/FlowMain.hpp

@@ -417,7 +417,12 @@ namespace Opm
                 ParseContext parseContext({{ ParseContext::PARSE_RANDOM_SLASH , InputError::IGNORE }});
                 deck_ = parser->parseFile(deck_filename, parseContext);
                 checkDeck(deck_, parser);
-                MissingFeatures::checkKeywords(*deck_);
+
+                if ( output_cout_)
+                {
+                    MissingFeatures::checkKeywords(*deck_);
+                }
+
                 eclipse_state_.reset(new EclipseState(*deck_, parseContext));
                 auto ioConfig = eclipse_state_->getIOConfig();
                 ioConfig->setOutputDir(output_dir_);