Scripts and tools: fixed Docker dependencies #14002

1. 
   hebasto commented at 9:45 pm on August 18, 2018: member

   The Docker does not depend on apt-cacher-ng package. Also see: https://github.com/bitcoin-core/docs/pull/33
2. fixed Docker dependencies

   The Docker does not depend on `apt-cacher-ng` package.

   fcfa8d740d
3. fanquake added the label Scripts and tools on Aug 19, 2018
4. 
   fanquake commented at 1:58 am on August 19, 2018: member

   @hebasto Can you combine this PR and #13999 into #13998. Given that all three are small changes to the same file, 3 separate PRs isn’t necessary, and having all the changes in a single PR makes for easier testing. You can keep the 3 individual commits.
5. 
   DrahtBot commented at 4:17 am on August 19, 2018: member

   • #13998 (Scripts and tools: fix error message if Docker installed already by hebasto)

   If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

6. Fix error message if Docker installed already

   Fix https://github.com/bitcoin/bitcoin/pull/13623#issuecomment-405684241

   a2a316e265
7. 
   hebasto commented at 6:50 am on August 19, 2018: member

   @fanquake This PR has been combined into #13998.
8. hebasto closed this on Aug 19, 2018

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9. MarcoFalke referenced this in commit f49b8d4783 on May 20, 2019
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Contributors
hebasto fanquake DrahtBot

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Scripts and tools