Remove unused RabbitMQ dynamic property flag

Fixes gh-1999

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.java

@@ -61,8 +61,6 @@ public class RabbitProperties {
 	 */
 	private String addresses;
 
-	private boolean dynamic = true;
-
 	public String getHost() {
 		if (this.addresses == null) {
 			return this.host;
@@ -149,14 +147,6 @@ public class RabbitProperties {
 		this.password = password;
 	}
 
-	public boolean isDynamic() {
-		return this.dynamic;
-	}
-
-	public void setDynamic(boolean dynamic) {
-		this.dynamic = dynamic;
-	}
-
 	public String getVirtualHost() {
 		return this.virtualHost;
 	}

spring-boot-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -89,6 +89,12 @@
     "description": "Enable SitePreferenceHandler.",
     "defaultValue": true
   },
+  {
+    "name": "spring.rabbitmq.dynamic",
+    "type": "java.lang.Boolean",
+    "description": "Create an AmqpAdmin bean.",
+    "defaultValue": true
+  },
   {
     "name": "spring.social.auto-connection-views",
     "type": "java.lang.Boolean",