Make cli work again for offline gen1 vacs, fix tests

[rytilahti]

• Vacuum overrides now the internal _fetch_info
• Fix tests for new integrations that were assigning now-readonly model

[codecov-commenter]

Codecov Report

Merging #1141 (4e8eb85) into master (75ac5fd) will decrease coverage by 0.59%.
The diff coverage is 25.78%.

@@            Coverage Diff             @@
##           master    #1141      +/-   ##
==========================================
- Coverage   76.08%   75.48%   -0.60%     
==========================================
  Files          75       76       +1     
  Lines        8847     8975     +128     
  Branches      759      750       -9     
==========================================
+ Hits         6731     6775      +44     
- Misses       1930     2018      +88     
+ Partials      186      182       -4     

Impacted Files	Coverage Δ
miio/airconditioningcompanion.py	96.46% <0.00%> (+0.96%)	⬆️
miio/airdehumidifier.py	84.09% <0.00%> (+1.86%)	⬆️
miio/airfresh.py	90.25% <0.00%> (+1.72%)	⬆️
miio/airfresh_t2017.py	95.06% <0.00%> (+3.39%)	⬆️
miio/airhumidifier_jsq.py	92.45% <0.00%> (-0.89%)	⬇️
miio/airhumidifier_mjjsq.py	92.30% <0.00%> (+2.94%)	⬆️
miio/airpurifier_airdog.py	91.20% <0.00%> (+8.20%)	⬆️
miio/airqualitymonitor.py	81.66% <0.00%> (+4.50%)	⬆️
miio/chuangmi_plug.py	87.75% <0.00%> (ø)
miio/fan_leshow.py	94.87% <0.00%> (+3.51%)	⬆️
... and 21 more

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