test: Remove temp directories from repo server tests

[jannfis]

Removes temp directories, so they don't interfere with consecutive test runs.

Also, some minor corrections by gofmt.

Signed-off-by: jannfis jann@mistrust.net

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[codecov]

Codecov Report

Merging #9501 (145076b) into master (725b2d4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9501   +/-   ##
=======================================
  Coverage   45.70%   45.70%           
=======================================
  Files         221      221           
  Lines       26293    26293           
=======================================
  Hits        12018    12018           
  Misses      12615    12615           
  Partials     1660     1660           

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[crenshaw-dev]

lgtm

[crenshaw-dev]

Cherry-picked onto 2.4 because it was bothering me.