Vsphere

[enxebre]

This introduces a basic vSphere implementation and limited ability to create/update machines so we can follow up in a collaborative manner.
Logic for interacting with vCenter is mostly based from https://github.com/kubernetes-sigs/cluster-api-provider-vsphere

Tested with

apiVersion: v1
kind: Secret
metadata:
 name: vsphere
 namespace: test
type: Opaque
data:
 user: echo -n 'user' | openssl base64
 password: echo -n 'password' | openssl base64

and

apiVersion: machine.openshift.io/v1beta1
kind: Machine
metadata:
  finalizers:
  - machine.machine.openshift.io
  labels:
    machine.openshift.io/cluster-api-cluster: agl091219-wd4n9
  name: test
  namespace: test
spec:
  metadata:
    creationTimestamp: null
  providerSpec:
    value:
      template: "templateValue"
      credentialsSecret: 
        name: "vsphere"
      workspace:
        datacenter: "Datacenter"
        server: "server"
        folder: "machine-api-dev"

Follow ups:
support userdata
support network/disk devices
set providerID

[bison]

/approve
/lgtm

I have not had a chance to run this yet to be honest, but it looks like a good start. I think we can merge this and unblock ourselves on further progress and testing.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bison

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[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-scaleup-rhel7	c7aa4ab	link	/test e2e-aws-scaleup-rhel7
ci/prow/e2e-azure	c7aa4ab	link	/test e2e-azure

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