QPID-8299: [Broker-J][JDBC Config Store] Possibility to customize the connection provider for the config of the Broker

This closes #25
diff --git a/broker-plugins/jdbc-store/src/main/java/org/apache/qpid/server/store/jdbc/JDBCSystemConfig.java b/broker-plugins/jdbc-store/src/main/java/org/apache/qpid/server/store/jdbc/JDBCSystemConfig.java
index 6a6d5f3..6766328 100644
--- a/broker-plugins/jdbc-store/src/main/java/org/apache/qpid/server/store/jdbc/JDBCSystemConfig.java
+++ b/broker-plugins/jdbc-store/src/main/java/org/apache/qpid/server/store/jdbc/JDBCSystemConfig.java
@@ -35,7 +35,7 @@
     String getConnectionUrl();
 
     @Override
-    @ManagedAttribute(defaultValue=DefaultConnectionProviderFactory.TYPE)
+    @ManagedAttribute(defaultValue = "${systemConfig.connectionPoolType}")
     String getConnectionPoolType();
 
     @Override