obfuscate heartbeat password; (#532)

Author: odemkovych

config/config.go

@@ -107,6 +107,9 @@ func withoutSensitiveInfo(config *Config) *Config {
 		c.Users[i].Password = pswPlaceHolder
 	}
 	for i := range c.Clusters {
+		if len(c.Clusters[i].HeartBeat.User) > 0 {
+			c.Clusters[i].HeartBeat.Password = pswPlaceHolder
+		}
 		if len(c.Clusters[i].KillQueryUser.Name) > 0 {
 			c.Clusters[i].KillQueryUser.Password = pswPlaceHolder
 		}

config/config_test.go

@@ -755,6 +755,7 @@ func TestRemovalSensitiveData(t *testing.T) {
 	conf.Clusters[0].KillQueryUser.Password = "XXX"
 	conf.Clusters[1].ClusterUsers[0].Password = "XXX"
 	conf.Clusters[1].ClusterUsers[1].Password = "XXX"
+	conf.Clusters[1].HeartBeat.Password = "XXX"
 	conf.Clusters[2].ClusterUsers[0].Password = "XXX"
 	conf.Caches[2].Redis.Password = "XXX"
 
@@ -845,7 +846,7 @@ clusters:
     response: |
       Ok.
     user: hbuser
-    password: hbpassword
+    password: XXX
   retry_number: 2
 - name: third cluster
   scheme: http