Move code to pkg

[ldez]

What does this PR do?

Move code to pkg:

.
├── .git
├── .github
├── .semaphoreci
├── .travis
├── autogen
├── cmd
├── contrib
├── dist
├── docs
├── examples
├── integration
├── old
├── pkg
├── script
├── static
├── vendor
└── webui

Motivation

Facilitate maintenance and contributions.

By separating the code from the "non-code" it is easier to contribute: it puts forward the doc, the contrib file, scripts, proto, ...

This a clear separation between cmd and the main code.

This will allow us to migrate the integration testing framework more easily without having to use build tags.

And lot of more things.

This type of structure tends to become a standard in GoLang for large projects.

• https://github.com/kubernetes/kubernetes
• https://github.com/istio/istio
• https://github.com/goreleaser/goreleaser
• https://github.com/rancher/k3s
• https://github.com/etcd-io/etcd
• https://github.com/prometheus/prometheus
• https://github.com/syncthing/syncthing
• https://github.com/perkeep/perkeep
• https://github.com/gogs/gogs

More

• Added/updated tests
• Added/updated documentation

[juliens]

LGTM

[jbdoumenjou]

LGTM

[geraldcroes]

🎈 LGTM 🎈

[mpl]

SGTM