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Fix panic running docker package tests

Alessio Caiazza requested to merge docker-version-template into master

What does this MR do?

This fixes panic running test with recent docker client.

Why was this MR needed?

docker version regexp broken by new docker release.

$ docker version
Client:
 Version:	17.12.0-ce
 API version:	1.35
 Go version:	go1.9.2
 Git commit:	c97c6d6
 Built:	Wed Dec 27 20:03:51 2017
 OS/Arch:	darwin/amd64

Server:
 Engine:
  Version:	17.12.0-ce
  API version:	1.35 (minimum version 1.12)
  Go version:	go1.9.2
  Git commit:	c97c6d6
  Built:	Wed Dec 27 20:12:29 2017
  OS/Arch:	linux/amd64
  Experimental:	true

This commit removes regexp checking and ask docker version to output only the {{.Server.Version}} field.

Are there points in the code the reviewer needs to double check?

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?

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