Refactor log tail method

[jleaniz]

Description of the change

Fix an issue with the tail helper method used by the API server to read log data.

Applicable issues

• fixes #

Additional information

Checklist

• [ ] All tests were successful.
• [ ] Unit tests added.
• [ ] Documentation updated.

[jleaniz]

@wajihyassine FYI should fix what we discussed last week.

[hacktobeer]

LGTM although still a bit sad you are not just using subprocess and tail -[NUM_LINES ;)