added default credential as properties

modules/analytics/distribution/output-adapter-change.xml

@@ -12,6 +12,8 @@
         <property key="dcrUrl">https://${iot.keymanager.host}:${iot.keymanager.https.port}/client-registration/v0.11/register</property>
         <property key="tokenUrl">https://${iot.gateway.host}:${iot.gateway.https.port}/token</property>
         <property key="url">tcp://${mqtt.broker.host}:${mqtt.broker.port}</property>
+        <property key="username">admin</property>
+		<property key="password">admin</property>
     </adapterConfig>
 
     <adapterConfig type="secured-websocket">

modules/core/distribution/output-adapter-change.xml

@@ -12,6 +12,8 @@
         <property key="dcrUrl">https://${iot.keymanager.host}:${iot.keymanager.https.port}/client-registration/v0.11/register</property>
         <property key="tokenUrl">https://${iot.gateway.host}:${iot.gateway.https.port}/token</property>
         <property key="url">tcp://${mqtt.broker.host}:${mqtt.broker.port}</property>
+        <property key="username">admin</property>
+		<property key="password">admin</property>
     </adapterConfig>
 
     <adapterConfig type="secured-websocket">