improved linting, better test setup/teardown, re'org and added tests

[gkspranger]

• removed all refs to clojure.test for tests in question
• simple kondo fixes for src/yetibot/core/util/format.clj
• better test setup for test/yetibot/core/test/adapters.clj
• better test teardown and mocking for test/yetibot/core/test/adapters/adapter.clj
• re'org and added tests for test/yetibot/core/test/util/format.clj

not the most meaningful PR -- but better use of and one step closer for the midje migration

[codecov[bot]]

Codecov Report

Merging #178 (6d63da6) into master (01c017f) will increase coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
+ Coverage   51.35%   51.37%   +0.02%     
==========================================
  Files          94       94              
  Lines        4132     4132              
  Branches      197      197              
==========================================
+ Hits         2122     2123       +1     
+ Misses       1813     1812       -1     
  Partials      197      197              

Impacted Files	Coverage Δ
src/yetibot/core/util/format.clj	81.08% <ø> (+1.35%)	:arrow_up:

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