tools/statink/upload_payload.py: Parser updates.
tools/statink/upload_payload.py: Parser updates.

* Add endpoint option.
* Remove --payload option. arg('payload') is now the primary argument.
* Remove IkaConfig import.

```
dhcp44-80:IkaLog_github12 hasegaw$ python3 tools/statink/upload_payload.py
usage: upload_payload.py [-h] [--api_key YOUR_API_KEY]
                         [--video_id YOUTUBE_VIDEO_ID]
                         [--endpoint API_ENDPOINT_URL]
                         STATINK_PAYLOAD_FILE
upload_payload.py: error: the following arguments are required: STATINK_PAYLOAD_FILE
```

Signed-off-by: Takeshi HASEGAWA <80595b5c49522665976d35e515d02ac963124d00@gmail.com>

hasegaw/IkaLog,deathmetalland/IkaLog,hasegaw/IkaLog,deathmetalland/IkaLog,hasegaw/IkaLog,deathmetalland/IkaLog