providers/aws: Update DB Replica to honor storage type

DB Replica can be of a different storage type, but we were skipping that part.
Note that they are created as the default (or as the primary?) initially,
and then modified to be of the correct type

builtin/providers/aws/resource_aws_db_instance.go

@@ -290,13 +290,19 @@ func resourceAwsDbInstanceCreate(d *schema.ResourceData, meta interface{}) error
 			opts.AvailabilityZone = aws.String(attr.(string))
 		}
 
+		if attr, ok := d.GetOk("storage_type"); ok {
+			opts.StorageType = aws.String(attr.(string))
+		}
+
 		if attr, ok := d.GetOk("publicly_accessible"); ok {
 			opts.PubliclyAccessible = aws.Bool(attr.(bool))
 		}
 
 		if attr, ok := d.GetOk("db_subnet_group_name"); ok {
 			opts.DBSubnetGroupName = aws.String(attr.(string))
 		}
+
+		log.Printf("[DEBUG] DB Instance Replica create configuration: %#v", opts)
 		_, err := conn.CreateDBInstanceReadReplica(&opts)
 		if err != nil {
 			return fmt.Errorf("Error creating DB Instance: %s", err)