311 listener

[bretambrose]

• Adds listener support to 311 connections for publish received and connection success only
• Refactors 311 protocol test fixture to be usable by multiple test .c files.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (a54824a) 82.60% compared to head (67db09c) 82.78%.
Report is 2 commits behind head on ProtocolAdapterSkeleton.

Files	Patch %	Lines
source/mqtt311_listener.c	90.90%	10 Missing ⚠️
source/v5/mqtt5_listener.c	0.00%	1 Missing ⚠️
source/v5/mqtt5_to_mqtt3_adapter.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##           ProtocolAdapterSkeleton     #344      +/-   ##
===========================================================
+ Coverage                    82.60%   82.78%   +0.17%     
===========================================================
  Files                           22       23       +1     
  Lines                         8941     9054     +113     
===========================================================
+ Hits                          7386     7495     +109     
- Misses                        1555     1559       +4     

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