Add ownerreferrences to manifest resources

[VaishnaviHire]

Fixes #209

Description

Every resource added by the operator will have following ownerrefferences

  ownerReferences:
    - apiVersion: kfdef.apps.kubeflow.org/v1
      kind: KfDef
      name: odh-core
      uid: <uid>
      controller: true
      blockOwnerDeletion: true

How Has This Been Tested?

1. Deploy operator using make deploy
2. Create odh-core KfDef
3. Delete KfDef

Note : resources like Grafana and prometheus will not be deleted, since they are managed by respective operators

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[LaVLaS]

While this PR have any affect on anyone using the kfctl cli with a kfdef?

[VaishnaviHire]

While this PR have any affect on anyone using the kfctl cli with a kfdef?

I had removed the cmd directory where kfctl cli is defined, from the operator, since its not being developed(is depricated). The idea was kfctl cli can be installed from upstream.

[LaVLaS]

/lgtm

[openshift-ci]

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