Module naming may cause issues & clashes with other python packages

[pbrkr]

Installing tb-mqtt-client results in the following files in python's site-packages directory:

__init__.py
sdk_utils.py
tb_device_http.py
tb_device_mqtt.py
tb_gateway_mqtt.py
utils.py

This gives me a few concerns:

• The __init__.py file at the top-level of site-packages may be imported automatically when anything else from that directory is imported. This could lead to issues if any content is added to this file.
• The names __init__.py, sdk_utils.py and utils.py are not very unique and may easily clash with modules from other Python packages.

I recommend moving these files into a single top-level module or prefixing the file names with something unique to prevent issues.