Update IBC host keys + cleanup

[colin-axner]

Description

I changed the redundant packets acknowledgements and receipts to use sequences to follow the nomenclature of ports/{}/channels/{}

closes: #7713 #7710

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• 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
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #7873 (dd60df5) into master (fdcb028) will decrease coverage by 0.00%.
The diff coverage is 53.12%.

@@            Coverage Diff             @@
##           master    #7873      +/-   ##
==========================================
- Coverage   54.19%   54.19%   -0.01%     
==========================================
  Files         610      610              
  Lines       38844    38846       +2     
==========================================
  Hits        21051    21051              
- Misses      15637    15639       +2     
  Partials     2156     2156              

[fedekunze]

ACK

[cwgoes]

ACK, though I agree with @AdityaSripal's comment