when I try to upload a large file, localstack basically freezes (and eventually times out).  
But if the file is all `1` bytes it succeeds.

succeeds:
```bash
aws s3 --endpoint-url=http://localhost:4572 mb s3://testbucket
python -c "print '\x01'*10000000" > testfile
echo $(ls -ahl | grep testfile)
aws s3 --endpoint-url=http://localhost:4572 cp testfile s3://testbucket/testfile
```

fails:
```bash
aws s3 --endpoint-url=http://localhost:4572 mb s3://testbucket
python -c "print 'a'*10000000" > testfile
echo $(ls -ahl | grep testfile)
aws s3 --endpoint-url=http://localhost:4572 cp testfile s3://testbucket/testfile
```
so, for me, both the file content and its size determine if this triggers or not. 
I'm using the latest version `0.9.5`
self.s3_client.create_bucket(Bucket=TEST_BUCKET_NAME_2)
        body = 'Lorem ipsum dolor sit amet, ... ' * 30
        rs = self.s3_client.put_object(Bucket=TEST_BUCKET_NAME_2, Key=TEST_KEY_2, Body=body)
        etag = rs['ETag']
        rs = self.s3_client.get_object(
            Bucket=TEST_BUCKET_NAME_2,
            Key=TEST_KEY_2
        )
        self.assertIn('ETag', rs)
        self.assertEqual(etag, rs['ETag'])
        self.assertEqual(rs['ContentLength'], len(body))
        rs = self.s3_client.get_object(
            Bucket=TEST_BUCKET_NAME_2,
            Key=TEST_KEY_2,
            Range='bytes=0-{}'.format(TEST_GET_OBJECT_RANGE - 1)
        )
        self.assertIn('ETag', rs)
        self.assertEqual(etag, rs['ETag'])
        self.assertEqual(rs['ContentLength'], TEST_GET_OBJECT_RANGE)
        
        self._delete_bucket(TEST_BUCKET_NAME_2, [TEST_KEY_2])
    def test_get_object_versioning(self):