Fix tests broken by zigpy update

[TheJulianJES]

This fixes tests that were broken by zigpy 0.60.3 (and later).

• the TSNs are changed because of Per-device TSNs zigpy#1309
• the watchdog loop is now started earlier because of Feed the watchdog before doing anything else zigpy#1308

For the watchdog change, we can also only move the startup phase (where the watchdog loop gets started) into where the period is patched: 464a9ff, but we might as well patch the period for the entire test (which I did for now). Or is there another preferred way to do it?

cc @puddly

Depending on how GitHub actions work, we might want to merge #245 first to have CI working.
EDIT: Yeah, looks like CI doesn't start at all, so am I fine to merge that Codecov CI first?

[puddly]

am I fine to merge that Codecov CI first?

Sure, go for it!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.10%. Comparing base (e3c9fcf) to head (3051bbe).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #246   +/-   ##
=======================================
  Coverage   98.10%   98.10%           
=======================================
  Files          43       43           
  Lines        3647     3647           
=======================================
  Hits         3578     3578           
  Misses         69       69           

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