Move to go modules and update libs

[barney-s]

Moving from gopkg to gomod dependency management.

• This removes vendor folder.
• Manually vendor in controller-reconciler.

Update dependencies

• Move to newer controller-tools, controller-runtime
• Update Makefile
• Update controller-reconciler

Fix headers in missing files Fix boilerplate license

[barney-s]

Expect a couple more pull requests as i try to get this to a working shape.

Will take this oppurtunity to modernize the code base (newer libs, kubebuilder 2 etc)