#29823: Refactor test_utils_general() to fix Coverity warnings

[rl1987]

https://trac.torproject.org/projects/tor/ticket/29823

[coveralls]

Pull Request Test Coverage Report for Build 4365

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1196 unchanged lines in 36 files lost coverage.
• Overall coverage decreased (-1.6%) to 61.74%

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Files with Coverage Reduction	New Missed Lines	%
src/feature/hs/hs_service.c	1	73.68%
src/feature/dirclient/dirclient.c	1	18.37%
src/feature/nodelist/nodelist.c	2	71.88%
src/core/or/policies.c	2	84.52%
src/feature/nodelist/microdesc.c	2	72.75%
src/lib/buf/buffers.c	2	90.93%
src/feature/client/addressmap.c	2	60.54%
src/feature/rend/rendcache.c	2	93.02%
src/lib/evloop/token_bucket.h	2	66.67%
src/lib/fs/files.c	2	67.21%

Totals
Change from base Build 4362:	-1.6%
Covered Lines:	45332
Relevant Lines:	73424

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💛 - Coveralls