Start mDNS when there is at least 9.1. kernel version

[mickel8]

mDNS relies on REUSEPORT option which was fixed in kernel version 9.1, search for REUSEPORT here

[codecov]

Codecov Report

Merging #37 (3211932) into master (39bf30c) will decrease coverage by 0.36%.
The diff coverage is 87.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage   80.17%   79.81%   -0.36%     
==========================================
  Files          25       25              
  Lines        1281     1288       +7     
==========================================
+ Hits         1027     1028       +1     
- Misses        254      260       +6     

Files	Coverage Δ
lib/ex_ice/priv/app.ex	88.88% <87.50%> (-11.12%)	⬇️

... and 2 files with indirect coverage changes

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