refactor: support specify the broker IP (robustmq#1565)

Author: echooymxq

src/broker-core/src/cluster.rs

@@ -69,7 +69,8 @@ impl ClusterStorage {
         cache_manager: &Arc<BrokerCacheManager>,
         config: &BrokerConfig,
     ) -> Result<BrokerNode, CommonError> {
-        let local_ip = get_local_ip();
+        let local_ip = config.broker_ip.clone()
+            .unwrap_or_else(|| get_local_ip());
         let extend = NodeExtend {
             mqtt: MqttNodeExtend {
                 grpc_addr: format!("{}:{}", local_ip, config.grpc_port),

src/common/config/src/config.rs

@@ -39,6 +39,9 @@ pub struct BrokerConfig {
     #[serde(default = "default_broker_id")]
     pub broker_id: u64,
 
+    #[serde(default)]
+    pub broker_ip: Option<String>,
+
     #[serde(default = "default_roles")]
     pub roles: Vec<String>,