**Apache Airflow version**:  1.10.10


**Kubernetes version (if you are using kubernetes)** (use `kubectl version`): v1.15.11

KubernetesPodOperator truncates logs when container produces more than 10 lines of logs before execution of `read_pod_logs` function. Is there any reason to make 10 as default value for `tail_lines` argument ?
```python
    def read_pod_logs(self, pod: V1Pod, tail_lines: int = 10):
        """Reads log from the POD"""
        try:
            return self._client.read_namespaced_pod_log(
                name=pod.metadata.name,
                namespace=pod.metadata.namespace,
                container='base',
                follow=True,
                tail_lines=tail_lines,
                _preload_content=False
            )
        except BaseHTTPError as e:
            raise AirflowException(
                'There was an error reading the kubernetes API: {}'.format(e)
            )
```
kubernetes_tests/test_kubernetes_pod_operator.py
pod_name_too_long = "a" * 221
        with self.assertRaises(AirflowException):
            KubernetesPodOperator(
                namespace='default',
                image="ubuntu:16.04",
                cmds=["bash", "-cx"],
                arguments=["echo 10"],
                labels={"foo": "bar"},
                name=pod_name_too_long,
                task_id="task" + self.get_current_task_name(),
                in_cluster=False,
                do_xcom_push=False,
            )
    @mock.patch("airflow.kubernetes.pod_launcher.PodLauncher.monitor_pod")
    def test_on_kill(self,