reraise termios.error as OSError

[tomleglaunec]

Greatly inspired by #114, termios.errorderives from Exception rather than OSError. Wraps termios functions to raise OSError with correct errno and strerrno.
Mostly encountered this issue when reopening socat ttys, but I get hard times reproducing the error on non-containered environments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.95%. Comparing base (5be57ef) to head (d1f11e2).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #117      +/-   ##
==========================================
+ Coverage   92.90%   92.95%   +0.04%     
==========================================
  Files          23       24       +1     
  Lines        3850     3876      +26     
==========================================
+ Hits         3577     3603      +26     
  Misses        273      273              

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