QPID-8505:[Broker-J] Change the date/time format to rfc3339 UTC representation in the default logging layouts

This closes #80
diff --git a/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerConsoleLogger.java b/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerConsoleLogger.java
index a9f4c6a..05dda21 100644
--- a/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerConsoleLogger.java
+++ b/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerConsoleLogger.java
@@ -29,7 +29,7 @@
 {
     String TYPE = "Console";
 
-    @ManagedAttribute(defaultValue = "%date %-5level [%thread] \\(%logger{2}\\) - %msg%n")
+    @ManagedAttribute(defaultValue = "%date{\"yyyy-MM-dd'T'HH:mm:ss,SSSXXX\", UTC} %-5level [%thread] \\(%logger{2}\\) - %msg%n")
     String getLayout();
 
     @ManagedAttribute(defaultValue = "STDOUT", validValues = {"org.apache.qpid.server.logging.logback.BrokerConsoleLoggerImpl#getAllConsoleStreamTarget()"})
diff --git a/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerFileLogger.java b/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerFileLogger.java
index 017773c..f2237f1 100644
--- a/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerFileLogger.java
+++ b/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/BrokerFileLogger.java
@@ -62,7 +62,7 @@
     @ManagedAttribute( defaultValue = "100")
     int getMaxFileSize();
 
-    @ManagedAttribute(defaultValue = "%date %-5level [%thread] \\(%logger{2}\\) - %msg%n")
+    @ManagedAttribute(defaultValue = "%date{\"yyyy-MM-dd'T'HH:mm:ss,SSSXXX\", UTC} %-5level [%thread] \\(%logger{2}\\) - %msg%n")
     String getLayout();
 
     @DerivedAttribute
diff --git a/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/VirtualHostFileLogger.java b/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/VirtualHostFileLogger.java
index 53c44d6..6a85ac5 100644
--- a/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/VirtualHostFileLogger.java
+++ b/broker-plugins/logging-logback/src/main/java/org/apache/qpid/server/logging/logback/VirtualHostFileLogger.java
@@ -61,7 +61,7 @@
     @ManagedAttribute( defaultValue = "100")
     int getMaxFileSize();
 
-    @ManagedAttribute(defaultValue = "%date %-5level [%thread] \\(%logger{2}\\) - %msg%n")
+    @ManagedAttribute(defaultValue = "%date{\"yyyy-MM-dd'T'HH:mm:ss,SSSXXX\", UTC} %-5level [%thread] \\(%logger{2}\\) - %msg%n")
     String getLayout();
 
     @DerivedAttribute