Add log_level option to config.toml

Aleksejrequested to merge
aleksej.paschenko/gitlab-ci-multi-runner:log-level-in-config-toml into master

What does this MR do?

This MR add log_level option to config.toml. If user removes log_level from the config, gitlab runner will not fallback to initial value of log_level

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

relevant issue #1049 (closed)

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