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##### SUMMARY
My self written module output includes a datetime.date object. This results in a type error here: https://github.com/ansible/ansible/blob/adcdee9bb0031577698246fcfc51f8af63a56a17/lib/ansible/module_utils/basic.py#L397

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
lib/ansible/module_utils/basic.py

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.9.6
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
python3

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

library/my_test.py
```python
from ansible.module_utils.basic import AnsibleModule
import datetime

if __name__ == '__main__':
    module = AnsibleModule(argument_spec=dict())
    module.exit_json(result={'test_date': datetime.datetime.now().date()})
```

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: test
  hosts: all
  tasks:
  - my_test:
    register: out
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
Running through without an error


##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
The module fails with an exception
<!--- Paste verbatim command output between quotes -->
```paste below
$ ansible-playbook -i localhost, -c local test.yml

PLAY [test] ************************************************************************************************************

TASK [Gathering Facts] *************************************************************************************************
ok: [localhost]

TASK [my_test] *********************************************************************************************************
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TypeError: Value of unknown type: <class 'datetime.date'>, 2020-07-12
fatal: [localhost]: FAILED! => {"changed": false, "module_stderr": "Traceback (most recent call last):\n  File \"/home/jdrummer/.ansible/tmp/ansible-tmp-1594559282.5458276-140886794481795/AnsiballZ_my_test.py\", line 102, in <module>\n    _ansiballz_main()\n  File \"/home/jdrummer/.ansible/tmp/ansible-tmp-1594559282.5458276-140886794481795/AnsiballZ_my_test.py\", line 94, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n  File \"/home/jdrummer/.ansible/tmp/ansible-tmp-1594559282.5458276-140886794481795/AnsiballZ_my_test.py\", line 40, in invoke_module\n    runpy.run_module(mod_name='ansible.modules.my_test', init_globals=None, run_name='__main__', alter_sys=True)\n  File \"/usr/lib/python3.8/runpy.py\", line 206, in run_module\n    return _run_module_code(code, init_globals, run_name, mod_spec)\n  File \"/usr/lib/python3.8/runpy.py\", line 96, in _run_module_code\n    _run_code(code, mod_globals, init_globals,\n  File \"/usr/lib/python3.8/runpy.py\", line 86, in _run_code\n    exec(code, run_globals)\n  File \"/tmp/ansible_my_test_payload_eacypa5q/ansible_my_test_payload.zip/ansible/modules/my_test.py\", line 6, in <module>\n  File \"/tmp/ansible_my_test_payload_eacypa5q/ansible_my_test_payload.zip/ansible/module_utils/basic.py\", line 2071, in exit_json\n  File \"/tmp/ansible_my_test_payload_eacypa5q/ansible_my_test_payload.zip/ansible/module_utils/basic.py\", line 2064, in _return_formatted\n  File \"/tmp/ansible_my_test_payload_eacypa5q/ansible_my_test_payload.zip/ansible/module_utils/basic.py\", line 418, in remove_values\n  File \"/tmp/ansible_my_test_payload_eacypa5q/ansible_my_test_payload.zip/ansible/module_utils/basic.py\", line 401, in _remove_values_conditions\nTypeError: Value of unknown type: <class 'datetime.date'>, 2020-07-12\n", "module_stdout": "", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}

PLAY RECAP *************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0
```

expand_user_and_vars=True, pass_fds=None, before_communicate_callback=None):
        '''
        Execute a command, returns rc, stdout, and stderr.
        :arg args: is the command to run
            * If args is a list, the command will be run with shell=False.
            * If args is a string and use_unsafe_shell=False it will split args to a list and run with shell=False
            * If args is a string and use_unsafe_shell=True it runs with shell=True.
        :kw check_rc: Whether to call fail_json in case of non zero RC.
            Default False
        :kw close_fds: See documentation for subprocess.Popen(). Default True
        :kw executable: See documentation for subprocess.Popen(). Default None
        :kw data: If given, information to write to the stdin of the command
        :kw binary_data: If False, append a newline to the data.  Default False
        :kw path_prefix: If given, additional path to find the command in.
            This adds to the PATH environment variable so helper commands in
            the same directory can also be found
        :kw cwd: If given, working directory to run the command inside
        :kw use_unsafe_shell: See `args` parameter.  Default False
        :kw prompt_regex: Regex string (not a compiled regex) which can be
            used to detect prompts in the stdout which would otherwise cause
            the execution to hang (especially if no input data is specified)
        :kw environ_update: dictionary to *update* os.environ with
        :kw umask: Umask to be used when running the command. Default None
        :kw encoding: Since we return native strings, on python3 we need to
            know the encoding to use to transform from bytes to text.  If you
            want to always get bytes back, use encoding=None.  The default is
            "utf-8".  This does not affect transformation of strings given as
            args.
        :kw errors: Since we return native strings, on python3 we need to
            transform stdout and stderr from bytes to text.  If the bytes are