Add `jkube-k8s` and `jkube-oc` packagings to support JKube's Kubernetes and OpenShift integrations

[alvarosanchez]

In order to support JKube's kubernetes-maven-plugin and openshift-maven-plugin, this plugin could add 2 additional packaging types:

• jkube-k8s: delegates to k8s:build for packaging and k8s:push for deployment.
• jkube-oc: delegates to oc:build for packaging and oc:push for deployment.

That way, users could benefit from the extra features that JKube offers, such as Kubernetes manifest generation, log access, etc.