adafruit_io_simpletest.py: fix aio_user to aio_username

[mytechnotalent]

This PR changes the aio_user to aio_username to keep consistent with the secrets.py file.

Currently a new maker will have a default secrets.py file with aio_username and this example will break.

[brentru]

@mytechnotalent Thanks for the catch.

I did a search for aio_user to check other files for inconsistencies, it's also within most of the _MQTT API examples:

• https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/blob/master/examples/adafruit_io_mqtt/adafruit_io_groups.py
• https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/blob/master/examples/adafruit_io_mqtt/adafruit_io_location.py
• https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/blob/master/examples/adafruit_io_mqtt/adafruit_io_simpletest_cellular.py
• https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/blob/master/examples/adafruit_io_mqtt/adafruit_io_simpletest_eth.py
• https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/blob/master/examples/adafruit_io_mqtt/adafruit_io_time.py

Would you mind editing the PR to change aio_user to aio_username in the files above? I'd like to completely remove this issue from the library

[mytechnotalent]

Sure @brentru I would be glad to. The problem I have now is running pylint on these files has a ton of issues. Any suggestions? I think you might have strengthened the rules after the file was created.

[brentru]

Thank you. The Pylint output in Actions is suppressed by the black output (https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/pull/48/checks#step:11:1). Could you black the files so I can check out the pylint errors?

[mytechnotalent]

`developer@DESKTOP-UK9RHDJ:/Adafruit_CircuitPython_AdafruitIO$ black examples/adafruit_io_simpletest.py
All done! ✨ 🍰 ✨
1 file left unchanged.
developer@DESKTOP-UK9RHDJ:/Adafruit_CircuitPython_AdafruitIO$ pylint examples/adafruit_io_simpletest.py
************* Module adafruit_io_simpletest
examples/adafruit_io_simpletest.py:1:0: C0114: Missing module docstring (missing-module-docstring)
examples/adafruit_io_simpletest.py:31:0: C0103: Constant name "esp32_cs" doesn't conform to '(([A-Z_][A-Z0-9_])|(__.))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:32:0: C0103: Constant name "esp32_ready" doesn't conform to '(([A-Z_][A-Z0-9_]*)|(.__))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:33:0: C0103: Constant name "esp32_reset" doesn't conform to '(([A-Z_][A-Z0-9_])|(.*))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:40:0: C0103: Constant name "spi" doesn't conform to '(([A-Z_][A-Z0-9_])|(__.))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:41:0: C0103: Constant name "esp" doesn't conform to '(([A-Z_][A-Z0-9_]*)|(.__))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:43:0: C0103: Constant name "status_light" doesn't conform to '(([A-Z_][A-Z0-9_])|(.*))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:55:0: C0103: Constant name "wifi" doesn't conform to '(([A-Z_][A-Z0-9_])|(__.))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:59:0: C0116: Missing function or method docstring (missing-function-docstring)
examples/adafruit_io_simpletest.py:69:0: C0116: Missing function or method docstring (missing-function-docstring)
examples/adafruit_io_simpletest.py:74:0: C0116: Missing function or method docstring (missing-function-docstring)
examples/adafruit_io_simpletest.py:80:0: C0116: Missing function or method docstring (missing-function-docstring)
examples/adafruit_io_simpletest.py:86:0: C0116: Missing function or method docstring (missing-function-docstring)
examples/adafruit_io_simpletest.py:102:0: C0103: Constant name "mqtt_client" doesn't conform to '(([A-Z_][A-Z0-9_]*)|(.__))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:110:0: C0103: Constant name "io" doesn't conform to '(([A-Z_][A-Z0-9_])|(.*))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:124:0: C0103: Constant name "last" doesn't conform to '(([A-Z_][A-Z0-9_])|(__.))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:131:8: C0103: Constant name "value" doesn't conform to '(([A-Z_][A-Z0-9_]*)|(.__))$' pattern (invalid-name)
examples/adafruit_io_simpletest.py:134:8: C0103: Constant name "last" doesn't conform to '(([A-Z_][A-Z0-9_])|(.*))$' pattern (invalid-name)

---

Your code has been rated at 6.90/10 (previous run: 6.90/10, +0.00)`

[mytechnotalent]

@brentru I updated all the files as requested and ran black on them. I also posted my pylint errors on the one file for an example.

[brentru]

Thanks!