Bug in access-group-policy-create CLI command

This is a bug in the IBM Cloud CLI, not in the IGC CLI.

This IBM Cloud CLI command doesn't work correctly:

```
$ ibmcloud iam access-group-policy-create GROUP_NAME --roles Viewer --resource-group-name RESOURCE_GROUP_NAME --attributes "resourceType=resource-group,resource=RESOURCE_GROUP_NAME"
```

It creates a policy with Viewer role and these details:

```
All service in RESOURCE_GROUP_NAME resource group
resourceType string equals resource-group, resource string equals RESOURCE_GROUP_NAME
```

When created through the GUI, the resulting policy has these details:

```
RESOURCE_GROUP_NAME resource group
resourceType string equals resource-group, resource string equals RESOURCE_GROUP_NAME
```

Notice the lack of the **All service in** clause. The policy without the clause allows users to crate a new service instance in the resource group; the policy with the clause does not.