spulec / moto / 7388

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More accurately mock ECS RegisterTaskDefinition (#3584)

The mocked response for ECS RegisterTaskDefinition has drifted from what
actually returns when run against a real ECS endpoint. I created a
minimal task definition for both EC2:

```
>>> ecs.register_task_definition(
      family="moto",
      containerDefinitions=[
          {
              "name": "hello_world",
              "image": "hello-world:latest",
              "memory": 400
           }
       ]
  )["taskDefinition"]

{'taskDefinitionArn': 'arn:aws:ecs:us-east-1:************:task-definition/moto:1',
 'containerDefinitions': [{'name': 'hello_world',
   'image': 'hello-world:latest',
   'cpu': 0,
   'memory': 400,
   'portMappings': [],
   'essential': True,
   'environment': [],
   'mountPoints': [],
   'volumesFrom': []}],
 'family': 'moto',
 'revision': 1,
 'volumes': [],
 'status': 'ACTIVE',
 'placementConstraints': [],
 'compatibilities': ['EC2']}
```

and FARGATE:
```
>>> ecs.register_task_definition(
      family="moto",
      containerDefinitions=[
          {
              "name": "hello_world",
              "image": "hello-world:latest",
              "memory": 400
           }
       ],
       requiresCompatibilities=["FARGATE"],
       networkMode="awsvpc",
       cpu="256",
       memory="512"
  )["taskDefinition"]

{'taskDefinitionArn': 'arn:aws:ecs:us-east-1:************:task-definition/moto:2',
 'containerDefinitions': [{'name': 'hello_world',
   'image': 'hello-world:latest',
   'cpu': 0,
   'memory': 400,
   'portMappings': [],
   'essential': True,
   'environment': [],
   'mountPoints': [],
   'volumesFrom': []}],
 'family': 'moto',
 'networkMode': 'awsvpc',
 'revision': 2,
 'volumes': [],
 'status': 'ACTIVE',
 'requiresAttributes': [{'name': 'com.amazonaws.ecs.capability.docker-remote-api.1.18'},
  {'name': 'ecs.capability.task-eni'}],
 'placementConstraints': [],
 'compatibilities': ['EC2', 'FAR... (continued)

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