Move DB cleanup to t.Cleanup

[flimzy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 24 lines in your changes missing coverage. Please review.

Project coverage is 62.96%. Comparing base (8f5c345) to head (5f01484).

Files	Patch %	Lines
kiviktest/kt/config.go	0.00%	7 Missing ⚠️
kiviktest/client/replicate.go	0.00%	3 Missing ⚠️
kiviktest/kt/connect.go	0.00%	3 Missing ⚠️
kiviktest/kt/kt.go	0.00%	3 Missing ⚠️
kiviktest/test.go	0.00%	3 Missing ⚠️
cmd/kivik/log/log.go	0.00%	2 Missing ⚠️
kiviktest/client/createdb.go	0.00%	1 Missing ⚠️
kiviktest/client/updates.go	0.00%	1 Missing ⚠️
x/memorydb/test/test.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1040      +/-   ##
==========================================
+ Coverage   62.88%   62.96%   +0.08%     
==========================================
  Files         286      286              
  Lines       18985    18965      -20     
==========================================
+ Hits        11939    11942       +3     
+ Misses       6511     6489      -22     
+ Partials      535      534       -1     

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