Support specifying ec2_group cidr_ip as a list

Support specifying ec2_group cidr_ip as a list

**Example:**

```yaml
ec2_group:
  name: ec2_group list example
  rules:
    - proto: tcp
      from_port: 3306
      to_port: 3306
      cidr_ip: [
        192.168.0.0/24,
        172.16.0.0/16,
        10.0.0.0/8,
      ]
```