test(dm): update python2 to python3

[lance6716]

Signed-off-by: lance6716 lance6716@gmail.com

What problem does this PR solve?

Issue Number: ref #4159

What is changed and how it works?

CI base image does not pre-install requests library, and this library does not support python2 now. We might always use python3 for integration tests

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

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[lance6716]

/cc @purelind

[lance6716]

/run-dm-integration-test

[purelind]

/run-dm-integration-test

[purelind]

/run-dm-integration-test

need fix UnicodeEncodeError in python3

[2022-11-07T07:28:28.217Z] get_illegal_char_task_status_failed resp= Traceback (most recent call last):

[2022-11-07T07:28:28.217Z]   File "/home/jenkins/agent/workspace/dm_ghpr_integration_test/go/src/github.com/pingcap/tiflow/dm/tests/openapi/client/openapi_task_check", line 736, in <module>

[2022-11-07T07:28:28.217Z]     func(*sys.argv[2:])

[2022-11-07T07:28:28.217Z]   File "/home/jenkins/agent/workspace/dm_ghpr_integration_test/go/src/github.com/pingcap/tiflow/dm/tests/openapi/client/openapi_task_check", line 360, in get_illegal_char_task_status_failed

[2022-11-07T07:28:28.217Z]     print("get_illegal_char_task_status_failed resp=", resp.json())

[2022-11-07T07:28:28.217Z] UnicodeEncodeError: 'ascii' codec can't encode character '\xcb' in position 120: ordinal not in range(128)

[lance6716]

/run-dm-integration-test

need fix UnicodeEncodeError in python3

[2022-11-07T07:28:28.217Z] get_illegal_char_task_status_failed resp= Traceback (most recent call last):

[2022-11-07T07:28:28.217Z]   File "/home/jenkins/agent/workspace/dm_ghpr_integration_test/go/src/github.com/pingcap/tiflow/dm/tests/openapi/client/openapi_task_check", line 736, in <module>

[2022-11-07T07:28:28.217Z]     func(*sys.argv[2:])

[2022-11-07T07:28:28.217Z]   File "/home/jenkins/agent/workspace/dm_ghpr_integration_test/go/src/github.com/pingcap/tiflow/dm/tests/openapi/client/openapi_task_check", line 360, in get_illegal_char_task_status_failed

[2022-11-07T07:28:28.217Z]     print("get_illegal_char_task_status_failed resp=", resp.json())

[2022-11-07T07:28:28.217Z] UnicodeEncodeError: 'ascii' codec can't encode character '\xcb' in position 120: ordinal not in range(128)

I can pass this test in my Python 3.10.8 local environment

[lance6716]

UnicodeEncodeError

@purelind and after some searching, this more often happens in python2 not python3 🤔

[purelind]

I just test this in Python 3.6.8 and will test in Python 3.10.8 later