Reduce warning and info messages in node log files (Artemis) (#449)

* Reduce warning and info messages in node log files (Artemis)
Add an additional lof message for conflicting states identified by the Notary.

* Upgraded severity of user login message from trace to debug.

* Suppress Artemis log4j WARNING's for core.server.checkDeadLetterAddressAndExpiryAddress

config/dev/log4j2.xml

@@ -57,5 +57,8 @@
             <AppenderRef ref="Console-Appender-Println"/>
             <AppenderRef ref="RollingFile-Appender" />
         </Logger>
+        <Logger name="org.apache.activemq.artemis.core.server" level="error" additivity="false">
+            <AppenderRef ref="RollingFile-Appender"/>

+        </Logger>
     </Loggers>
 </Configuration>

core/src/main/kotlin/net/corda/flows/NotaryFlow.kt

@@ -134,6 +134,7 @@ object NotaryFlow {
                 }
                 if (conflicts.isNotEmpty()) {
                     // TODO: Create a new UniquenessException that only contains the conflicts filtered above.
+                    logger.warn("Notary conflicts for $txId: $conflicts")
                     throw notaryException(txId, e)
                 }
             }

node/src/main/kotlin/net/corda/node/services/messaging/ArtemisMessagingServer.kt

@@ -576,7 +576,7 @@ class NodeLoginModule : LoginModule {
         val password = String(passwordCallback.password ?: throw FailedLoginException("Password not provided"))
         val certificates = certificateCallback.certificates
 
-        log.info("Processing login for $username")
+        log.debug { "Processing login for $username" }
 
         try {
             val validatedUser = when (determineUserRole(certificates, username)) {