Use MqttService::connect_timeout() only for reading protocol version

[fafhrd91]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 41.30435% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 66.30%. Comparing base (480b8ef) to head (055f5f8).

Files	Patch %	Lines
src/server.rs	53.57%	13 Missing ⚠️
src/v5/router.rs	0.00%	9 Missing ⚠️
src/v3/router.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #167   +/-   ##
=======================================
  Coverage   66.30%   66.30%           
=======================================
  Files          53       53           
  Lines        9371     9325   -46     
=======================================
- Hits         6213     6183   -30     
+ Misses       3158     3142   -16     

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