Enable SO_REUSE{ADDR,PORT} for renderd TCP/IP server sockets

[hummeltech]

Otherwise renderd processes configured to use TCP/IP server sockets may need to wait until the address and/or port are released before restarting under certain circumstances (especially an ungraceful termination).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 84.30%. Comparing base (c4e3e62) to head (e9ad621).
Report is 6 commits behind head on master.

Files	Patch %	Lines
src/renderd.c	33.33%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #460      +/-   ##
==========================================
+ Coverage   81.54%   84.30%   +2.76%     
==========================================
  Files          24       24              
  Lines        5645     5340     -305     
==========================================
- Hits         4603     4502     -101     
+ Misses       1042      838     -204     

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