Fix premature cgroups cleanup
In 5f5c0c55, the refactoring resulted in cgroups being cleaned up
right after they were created. This change moves the cleanup to run()
which only returns when Gitaly finishes.
In 5f5c0c55, the refactoring resulted in cgroups being cleaned up
right after they were created. This change moves the cleanup to run()
which only returns when Gitaly finishes.