Removed OptionalMsgFieldTest Files

src/test/resources/middleware/mqtt/OptionalMsgField.ema

-package middleware.mqtt;
-
-component OptionalMsgField{
-    port in Q in1;
-    port out Q out1;
-}
\ No newline at end of file

src/test/resources/middleware/mqtt/OptionalMsgField.tag

-package middleware.mqtt;
-conforms to middleware.mqtt.MqttToEmamTagSchema;
-
-tags OptionalMsgField{
-tag optionalMsgField.in1 with MqttConnection = {topic = name1};
-tag optionalMsgField.out1 with MqttConnection = {topic = name1, msgField = msgField1};
-}
\ No newline at end of file