Declare destroyable attr

[myksyr-tdy]

This is useful when handling persistent objects, like 802.1AR IDevID.

[MatthiasValvekens]

Those failing tests seem to be related to an upstream change (#233). I pushed a change to master to disable the offending test when running against opencryptoki for now.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.45%. Comparing base (1ff2114) to head (775136e).
⚠️ Report is 24 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
+ Coverage   90.17%   91.45%   +1.28%     
==========================================
  Files          15       15              
  Lines        2625     2693      +68     
  Branches       29       27       -2     
==========================================
+ Hits         2367     2463      +96     
+ Misses        255      228      -27     
+ Partials        3        2       -1     

Flag	Coverage Δ
unittests	91.45% <100.00%> (+1.28%)	⬆️

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