Expose a dynamic client in the Operator struct

[enxebre]

This is so baremetal can fetch the provisioning.metal3.io object and parameterize their deployment. Related openshift/api#540 and #460

[enxebre]

cc @sadasu you can then just fetch the provisioning object and parameterise the baremetal deployment at your convenience.
You can unit test your code the likes of:

yamlContent := `apiVersion: metal3.io/v1alpha1
kind: Provisioning
metadata:
  name: test
spec:
  provisioningInterface: "test"
`
	u := &unstructured.Unstructured{Object: map[string]interface{}{}}
	if err := yaml.Unmarshal([]byte(yamlContent), &u); err != nil {
		t.Errorf("unmarshall %v", err)
	}
	t.Logf("Unstructured %+v", u)
	dynamicClient := dynamicfake.NewSimpleDynamicClient(runtime.NewScheme(), u)
	o, err := dynamicClient.Resource(schema.GroupVersionResource{
		Group: "metal3.io", Version: "v1alpha1", Resource: "provisionings"}).Get("test", metav1.GetOptions{})
	if err != nil {
		t.Errorf("Error on get %v", err)
	}
	t.Logf("All good %v", o)

Once all get merged please make sure to reflect the latest discussions here https://github.com/openshift/enhancements/blob/master/enhancements/baremetal/baremetal-provisioning-config.md

[bison]

/approve
/lgtm

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[openshift-ci-robot]

@enxebre: The following test failed, say /retest to rerun all failed tests:

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[enxebre]

Alternative in case we transition the baremetal components into its own operator to watch these resources https://github.com/openshift/machine-api-operator/compare/master...enxebre:dynamic-informer?expand=1