Add lifecycle ignore on az's

Author: myoung34

main.tf

@@ -241,6 +241,12 @@ resource "aws_rds_cluster" "default" {
   storage_encrypted               = "${var.storage_encrypted}"
   apply_immediately               = "${var.apply_immediately}"
   db_cluster_parameter_group_name = "${var.db_cluster_parameter_group_name}"
+
+  lifecycle {
+    ignore_changes = [
+      "availability_zones",
+    ]
+  }
 }
 
 // Geneate an ID when an environment is initialised