Replace config with _config in azure_rm_common.py to support azure-mgmt-network latest version

[saito-hideki]

SUMMARY

In azure-mgmt-network version 16.0.0 (or later), config seems to have been replaced with _config. config is only used in some logic, but it raises an AttributeError, especially when cert_validation_mode: ignore is specified.
This PR replaces config with _config to address this matter.

• Fixes azure_rm_privateendpoint failed with AttributeError if cert_validation_mode: ignore specified #903

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

• plugins/module_utils/azure_rm_common.py

ADDITIONAL INFORMATION

None

[Fred-sun]

@saito-hideki The Track2 SDK configuration parameter is ‘_config’, and the Track1 configuration parameter is ‘config’. Thank you very much!

[saito-hideki]

@Fred-sun Thanks for your advice! :)
I'm new to azure python SDK, so I had replaced config with _config for Track1, but I reverted back. And only replaced it for Track2 like below:

        if not is_track2:
            client.config = self.add_user_agent(client.config)

        if not is_track2 and self.azure_auth._cert_validation_mode == 'ignore':
            client.config.session_configuration_callback = self._validation_ignore_callback
        else:
            client._config.session_configuration_callback = self._validation_ignore_callback

Please let me know if I'm wrong about them.

[Fred-sun]

@saito-hideki The proposal presses the following way to change, can better. Thank you very much!

        if not is_track2:
            client.config = self.add_user_agent(client.config)
            if self.azure_auth._cert_validation_mode == 'ignore':
                client.config.session_configuration_callback = self._validation_ignore_callback
        else:
            if self.azure_auth._cert_validation_mode == 'ignore':
                client._config.session_configuration_callback = self._validation_ignore_callback

[saito-hideki]

@Fred-sun Thank you for your advice!
I have fixed this PR according to your advice #904 (comment)
I would appreciate it if you could review it :)

[xuzhang3]

LGTM