Problem: app utils triggers import cycle easily

[mmsqe]

mv to testutil and config

prepare for #475

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)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.93%. Comparing base (b677927) to head (ee0677e).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #477      +/-   ##
===========================================
- Coverage    63.09%   62.93%   -0.17%     
===========================================
  Files          127      126       -1     
  Lines         9631     9480     -151     
===========================================
- Hits          6077     5966     -111     
+ Misses        3007     2974      -33     
+ Partials       547      540       -7     

Files	Coverage Δ
app/app.go	76.95% <ø> (ø)

... and 2 files with indirect coverage changes