Use proper logging for artifacts rake task

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated
• [-] API support added
• Tests
  • [-] Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

Example:

I, [2017-08-25T10:21:47.773225 #84931]  INFO -- : Starting transfer of artifacts
E, [2017-08-25T10:21:47.928945 #84931] ERROR -- : Failed to transfer artifacts of 1 with error: Object Storage is not enabled