remove some unused glue code.

[pphaneuf]

This is part of #2245.

Checklist

• I have updated the CHANGELOG.
  • Adjust the draft version number according to semantic versioning rules.
• I have updated documentation accordingly (including the feature implementation matrix).

[codecov]

Codecov Report

Merging #2332 (e6ad361) into master (ec49bee) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2332      +/-   ##
==========================================
+ Coverage   65.90%   65.96%   +0.05%     
==========================================
  Files         106      105       -1     
  Lines        7749     7745       -4     
==========================================
+ Hits         5107     5109       +2     
+ Misses       2106     2100       -6     
  Partials      536      536              

Impacted Files	Coverage Δ
crypto/signer.go	88.00% <ø> (+9.42%)	⬆️
log/operation_manager.go	89.41% <0.00%> (+1.05%)	⬆️

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[pphaneuf]

PTAL?

[NatalieDoduc]

LGTM. Nit could you reword the commit to explicitly say "Removed the deprecated crypto.NewSHA256Signer function."

[pphaneuf]

Done.