- passes() method counts any message not /^pass/i as failure
- rearranges guards at top
- defines fail and pass prefixes, fail messages
- removes exit() and sets _halt_on_error to False
- compareVals now using _pass() and _fail()
- changes uses of f-string to modulo-string formatting, allowing tests to run on F24
And remove flakey helper method in LFUtils, just make user specify
the resource ID when removing ports.
The sta_connect.py script will create a station, run traffic, and calculate
pass/fail based on the results. Idea is for it to be part of a unit-test framework.
