Drop useless files

[MateoLostanlen]

The aim of this PR is to do a bit of cleaning:

1. we are not using pizeros so pizeros related files are removed
2. We are not usiing a wifi routeur so routeur related files / elements are removed too
3. Drop useless one test

[codecov]

Codecov Report

Merging #80 (53ce9c5) into develop (6565aaa) will decrease coverage by 3.91%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #80      +/-   ##
===========================================
- Coverage    68.12%   64.20%   -3.92%     
===========================================
  Files            7        5       -2     
  Lines          229      176      -53     
===========================================
- Hits           156      113      -43     
+ Misses          73       63      -10     

Flag	Coverage Δ
unittests	64.20% <ø> (-3.92%)	⬇️

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Impacted Files	Coverage Δ
pyroengine/pi_utils/monitor_pi.py	91.17% <ø> (ø)

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[MateoLostanlen]

I will improve coverage when #83 will be merge

[frgfm]

Thanks! I wasn't sure about the router reboot check though

[frgfm]

Thanks!