AWS: cli for attaching policies to roles

* Create the IAM permission policy

```
aws iam create-policy --policy-name kopsK8sEC2MasterPerms --policy-doc file://kopsK8sEC2MasterPerms.json
```

* Get policy's ARN

```
POLICY_ARN=$(aws iam list-policies | jq ".Policies[] | select(.PolicyName | contains(\"kopsK8sEC2MasterPerms\")) | .Arn" -r)
```

* Check for the name of the role attached to the master nodes

```
aws iam list-roles | jq ".Roles[] | select(.RoleName | contains(\"masters.$CLUSTER_NAME.$DOMAIN\"))"
```

* Link the new policy to the role

```
aws iam attach-role-policy --role-name masters.$CLUSTER_NAME.$DOMAIN --policy-arn $POLICY_ARN
```