provider/aws: Treat INACTIVE ECS TDs as deleted in acc tests

[radeksimko]

The fix was already implemented in #3924 but I forgot to do this for tests, hence these were failing.

This PR is also fixing the following failures by using ARN instead of ID (TD family):

=== RUN   TestAccAWSEcsTaskDefinition_basic
--- FAIL: TestAccAWSEcsTaskDefinition_basic (13.57s)
    testing.go:165: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.

        Error: Check failed: ClientException: Unable to describe task definition.
            status code: 400, request id: abcd123f-a434-11e5-a12c-5d8de85cf2ff

        State: <no state>
=== RUN   TestAccAWSEcsTaskDefinition_withScratchVolume
--- FAIL: TestAccAWSEcsTaskDefinition_withScratchVolume (7.91s)
    testing.go:165: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.

        Error: Check failed: ClientException: Unable to describe task definition.
            status code: 400, request id: abcd123f-a434-a12c-abb1-eb4dd31a84df

        State: <no state>
=== RUN   TestAccAWSEcsTaskDefinition_withEcsService
--- FAIL: TestAccAWSEcsTaskDefinition_withEcsService (115.39s)
    testing.go:165: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.

        Error: Check failed: ClientException: Unable to describe task definition.
            status code: 400, request id: abcd123f-a435-11e5-a12c-55bc0aaa1ee9

        State: <no state>

[phinze]

LGTM

[ghost]

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