Add build support of S2I build

[surajssd]

This is again a specific use case that solves the build story #273 for kedge using OpenShift S2I.

• When provider is OpenShift then do builds using S2I
• Generate buildconfig and imagestream

[surajssd]

Right now this is blocked on the openshift support #299 and #288 and This is blocked on #315

[surajssd]

Also before doing this, we should implement #331

[kadel]

Also before doing this, we should implement #331

This is not related to BuildConfigs in Kedge file. It should be about adding another building strategy for kedge build command. On the background, it might generate BuildConfig on the fly but that is not related to BuildConfig definition in Kedge file.

[kadel]

First version of this should allow to set image name and builder image

kedge build --context directory --image output-image --builder-image builderImage:tag

this command should generate something similar to this:

apiVersion: v1
kind: ImageStream
metadata:
  name: output-image
spec:
  tags:
  - name: latest

---
kind: BuildConfig
apiVersion: v1
metadata:
  name: output-image
spec:
  strategy:
    type: Binary
    sourceStrategy:
      from:
        kind: DockerImage
        name: builderImage:tag
  output:
    to:
      kind: "ImageStreamTag"
      name: "output-image:latest"

and than run
oc start-build output-image --follow --from-dir directory

[kadel]

closed in #452