chectl inject should support oc CLI

Is your enhancement related to a problem? Please describe.

Currently, chectl workspace inject -k command uses kubectl to copy a kubeconfig file from local machine to the plugin sidecar. It was introduced in the PR https://github.com/che-incubator/chectl/pull/33 and supposed to be used with Che deployed on minikube, with Che Kubernetes Plugin.

chectl workspace inject -k command may be also helpful with Che deployed on minishift. For that, it has be improved to use oc CLI as well.

Describe the solution you’d like

chectl may detect which platform is currently used (minikube/minishift) and use kubectl or oc CLI.

Describe alternatives you’ve considered

From Mario’s comment:

An alternative is to check if kubectl is installed locally and if it’s not check for oc. kubectl and oc are interchangeable so it doesn’t matter if the platform is openshift or kubernetes: kubectl works on an openshift cluster and oc works on a kubernetes cluster.

Additional context

kubectl cp command usage in chectl sources https://github.com/che-incubator/chectl/blob/1744186acbf0b78404cb1fd267e8ce1a9985144e/src/commands/workspace/inject.ts#L173

[l0rd]

chectl may detect which platform is currently used (minikube/minishift) and use kubectl or oc CLI.

An alternative is to check if kubectl is installed locally and if it’s not check for oc. kubectl and oc are interchangeable so it doesn’t matter if the platform is openshift or kubernetes: kubectl works on an openshift cluster and oc works on a kubernetes cluster.

[mmorhun]

Also need to implement the command for Openshift case.