udp: improve logging (and vairous changes)

[da2ce7]

When making this pull request I found that there was logic for the UDP tracker when in private mode: that we do not support, so I removed this dead-code.

I also found that the ConnectionId was not being checked for scrape requests, and when parsing badly formatted requests, so I corrected for this.

I also added the statistic counting for how many error responses have been sent.

[codecov]

Codecov Report

Attention: Patch coverage is 80.64516% with 18 lines in your changes missing coverage. Please review.

Project coverage is 76.25%. Comparing base (b827c31) to head (8c70395).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/core/statistics.rs	0.00%	12 Missing ⚠️
src/servers/udp/handlers.rs	90.32%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1095      +/-   ##
===========================================
- Coverage    76.44%   76.25%   -0.19%     
===========================================
  Files          174      174              
  Lines        11488    11377     -111     
  Branches     11488    11377     -111     
===========================================
- Hits          8782     8676     -106     
+ Misses        2507     2503       -4     
+ Partials       199      198       -1     

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[josecelano]

Gi @da2ce7 I think having the error counter in stats is a good feature. The only way to check errors now is to log into the server and check logs. At least, I can load the API enpoint to get that info. Althougth It only includes only the handled protocol errors.

[josecelano]

ACK 8c70395