[18.09 backport] Add initial scripts for Ubuntu Cosmic (18.10)

[thaJeztah]

Backport of #121 for 18.09

git checkout -b 18.09_backport_cosmic upstream/18.09
git cherry-pick -s -S -x 3228c358954810ad1664dbf1d96c7e55655e8850

cherry-pick was clean; no conflicts

[thaJeztah]

ping @seemethere @jose-bigio @mataneja - opened this for discussion, otherwise we'll probably end up with a lot of requests for adding support for Ubuntu 18.10 for Docker 18.09 CE

[jose-bigio]

Thanks so much @thaJeztah!
I am not exactly sure on what our policy is regarding on boarding distributions.

I am guessing that we wouldn't want to bring this in before the RC1 which is scheduled on 10/29 because all the validation has already been done against the other distributions.

In that case I think we would be targeting this for a patch release. In the past I think there has either been a policy or at least a push to not on board distributions in patch releases.

In any case I am going to defer to others on this decision. I'm also going to cc @dave-tucker and @antonybichon17 to get it on their radars.

[thaJeztah]

I think we started to decouple (patch) releases from supported distro's, at least for CE. EE of course needs a full validation cycle and addition to the support matrix (for commercial support), and only supports a subset of distros/architectures, and only LTS releases.

On a side-note; Fedora 29 is also around the corner, so we should prepare building for that

[jose-bigio]

LGTM

[myob-brad]

Just FYI.....
As of January 24th, 2019 any and all instructions I've been able to google to get Docker-ce package to work in Ubuntu or Kubuntu 18.10 are still bringing up "Package docker-ce is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'docker-ce' has no installation candidate"
Couldn't get docker to work in Fedora 29 and now I'm mucking about wasting time with Ubuntu/Kubuntu one would think by January 24th from October 2018 something could be figured out. The only reason why I'm mucking about with Docker is because VMWare removed all 64 bit support for their free version of VMWare Player 15.

[thaJeztah]

Package should be available on the stable channel; https://download.docker.com/linux/ubuntu/dists/cosmic/pool/stable/amd64/