DownloadProgressBar truncates messages to terminal width

[kontura]

Longer messages are cut short, this could be confusing for users.

For example, test scenario: Scenario: present user understandable message when there is a mismatch between available repodata and packages in metadata.feature produces output like:

      Updating and loading repositories:
       simple-base test repository            100% | 464.8 KiB/s |   2.3 KiB |  00m00s
      Repositories loaded.
      Total size of inbound packages is 6 KiB. Need to download 6 KiB.
      After this operation, 0 B extra will be used (install 0 B, remove 0 B).
      [1/1] labirinto-0:1.0-1.fc29.x86_64       0% |   0.0   B/s |   0.0   B |  00m00s
      >>> Interrupted by header callback: Inconsistent server data, reported file Cont
      >>> Interrupted by header callback: Inconsistent server data, reported file Cont
      >>> Interrupted by header callback: Inconsistent server data, reported file Cont
      >>> Interrupted by header callback: Inconsistent server data, reported file Cont
      >>> No more mirrors to try - All mirrors were already tried without success
      --------------------------------------------------------------------------------
      [1/1] Total                             100% |   0.0   B/s |   0.0   B |  00m00s
      Failed to download packages
       Librepo error: Cannot download x86_64/labirinto-1.0-1.fc29.x86_64.rpm: All mirrors were tried

I don't think this is user understandable message.