patch auth register cdc

[fedekunze]

Closes: Chainsafe/ethermint#235

Description

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[alexanderbez]

LGTM

[codecov]

Codecov Report

Merging #5892 into master will decrease coverage by 0.01%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master    #5892      +/-   ##
==========================================
- Coverage   56.82%   56.80%   -0.02%     
==========================================
  Files         342      342              
  Lines       20044    20046       +2     
==========================================
- Hits        11389    11388       -1     
- Misses       7805     7808       +3     
  Partials      850      850