Fix run_tests.sh when running locally

[fabriziocucci]

When running locally:

$ ./run_tests.sh
Re-running as root with sudo
./run_tests.sh: line 19: docker-compose: command not found

Hopefully this doesn't break the CI run...

[codecov]

Codecov Report

Merging #217 (dc6c526) into master (f7a066a) will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #217      +/-   ##
==========================================
+ Coverage   61.81%   61.97%   +0.16%     
==========================================
  Files          88       88              
  Lines        4345     4345              
==========================================
+ Hits         2686     2693       +7     
+ Misses       1325     1318       -7     
  Partials      334      334              

Flag	Coverage Δ
integration	56.82% <ø> (+0.16%)	⬆️
integration_storage	100.00% <ø> (ø)
unittests	49.74% <ø> (+0.34%)	⬆️

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Impacted Files	Coverage Δ
plugins/teststeps/slowecho/slowecho.go	62.26% <0.00%> (+13.20%)	⬆️

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[rojer9-fb]

looks good, thanks!