Fixtures for public_key table

[ethantkoenig]

TestAPIAdminCreateAndDeleteSSHKey is failing for me locally, because keys created in previous test runs are not deleted.

[lafriks]

LGTM

[codecov-io]

Codecov Report

Merging #3140 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3140      +/-   ##
==========================================
- Coverage   34.85%   34.83%   -0.02%     
==========================================
  Files         275      275              
  Lines       40030    40030              
==========================================
- Hits        13951    13944       -7     
- Misses      24084    24089       +5     
- Partials     1995     1997       +2

Impacted Files	Coverage Δ
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
models/ssh_key.go	31.92% <0%> (-0.74%)	⬇️

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[lunny]

LGTM