Set sndbuf=1024 and rcvbuf=1024 for socat test server

[puddly]

socat relied on kernel networking buffer sizes for this unit test, which may not always be small enough to cause tests to fail. We should instead use the socat-provided config params to limit the size.

Fixes #105.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.35%. Comparing base (5b4fd47) to head (6dfee49).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #106   +/-   ##
=======================================
  Coverage   92.35%   92.35%           
=======================================
  Files          22       22           
  Lines        3661     3661           
=======================================
  Hits         3381     3381           
  Misses        280      280           

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