add vpc vpc check script

```
usage: check_vpc_vpn.py [-h] -a AWS_ACCESS_KEY_ID -s AWS_SECRET_ACCESS_KEY -r
                        REGION

Check status of all existing AWS VPC VPN Tunnels

optional arguments:
  -h, --help            show this help message and exit
  -a AWS_ACCESS_KEY_ID, --aws-access-key-id AWS_ACCESS_KEY_ID
                        AWS Access Key
  -s AWS_SECRET_ACCESS_KEY, --aws-secret-access-key AWS_SECRET_ACCESS_KEY
                        AWS Secret Access Key
  -r REGION, --region REGION
                        AWS Region
```

Sample output:
```
WARN: [gateway: vgw-xxxxxxxx connection: vpn-xxxxxxxx tunnel: xxx.xxx.xxx.xxx status: DOWN]
```