Automatic merge from submit-queue

vSphere storage policy support for dynamic volume provisioning

Till now, vSphere cloud provider provides support to configure persistent volume with VSAN storage capabilities - kubernetes#42974. Right now this only works with VSAN.

Also there might be other use cases:

- The user might need a way to configure a policy on other datastores like VMFS, NFS etc.
- Use Storage IO control, VMCrypt policies for a persistent disk.

We can achieve about 2 use cases by using existing storage policies which are already created on vCenter using the Storage Policy Based Management service. The user will specify the SPBM policy ID as part of dynamic provisioning 

- resultant persistent volume will have the policy configured with it. 
- The persistent volume will be created on the compatible datastore that satisfies the storage policy requirements. 
- If there are multiple compatible datastores, the datastore with the max free space would be chosen by default.
- If the user specifies the datastore along with the storage policy ID, the volume will created on this datastore if its compatible. In case if the user specified datastore is incompatible, it would error out the reasons for incompatibility to the user.
- Also, the user will be able to see the associations of persistent volume object with the policy on the vCenter once the volume is attached to the node.

For instance in the below example, the volume will created on a compatible datastore with max free space that satisfies the "Gold" storage policy requirements.

```
kind: StorageClass
apiVersion: storage.k8s.io/v1beta1
metadata:
       name: fast
provisioner: kubernetes.io/vsphere-volume
parameters:
      diskformat: zeroedthick
      storagepolicyName: Gold
```

For instance in the below example, the vSphere CP checks if "VSANDatastore" is compatible with "Gold" storage policy requirements. If yes, volume will be provisioned on "VSANDatastore" else it will error that "VSANDatastore" is not compatible with the exact reason for failure.

```
kind: StorageClass
apiVersion: storage.k8s.io/v1beta1
metadata:
       name: fast
provisioner: kubernetes.io/vsphere-volume
parameters:
      diskformat: zeroedthick
      storagepolicyName: Gold
      datastore: VSANDatastore
```

As a part of this change, 4 commits have been added to this PR.

1. Vendor changes for vmware/govmomi
2. Changes to the VsphereVirtualDiskVolumeSource in the Kubernetes API. Added 2 additional fields StoragePolicyName, StoragePolicyID
3. Swagger and Open spec API changes.
4. vSphere Cloud Provider changes to implement the storage policy support.

**Release note**:


```release-note
vSphere cloud provider: vSphere Storage policy Support for dynamic volume provisioning
```