[#2267] Add missing disconnect handling

Clear state of client factory when connection to service is lost.

Signed-off-by: Kai Hudalla <kai.hudalla@bosch.io>

clients/adapter-amqp/src/main/java/org/eclipse/hono/adapter/client/registry/amqp/ProtonBasedCredentialsClient.java

@@ -94,6 +94,16 @@ private Future<org.eclipse.hono.client.CredentialsClient> getOrCreateCredentials
                 }));
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * Clears the state of the client factory.
+     */
+    @Override
+    protected void onDisconnect() {
+        clientFactory.clearState();
+    }
+
     /**
      * {@inheritDoc}
      */

clients/adapter-amqp/src/main/java/org/eclipse/hono/adapter/client/registry/amqp/ProtonBasedDeviceRegistrationClient.java

@@ -98,6 +98,16 @@ private void handleTenantTimeout(final Message<String> msg) {
         }
     }
 
+    /**
+     * {@inheritDoc}
+     *
+     * Clears the state of the client factory.
+     */
+    @Override
+    protected void onDisconnect() {
+        clientFactory.clearState();
+    }
+
     /**
      * {@inheritDoc}
      */