Updates generateUserData to fill default VMFolder if not provided.

[ykakarap]

What this PR does / why we need it:
cloudconfig needs a valid vmFolder value. Since it is an optional field in the VsphereMachineProviderConfig (whose values are used to generate the cloudconfig) as of now we need to fill in a valid default value if not provided.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #401

Special notes for your reviewer:
The generateUserData is updated to fill in a default value for VMFolder in cloudconfig if it is not provided.
This needed a change in govmomi. vmware/govmomi#1515 makes the required changes.
The go.mod, go.sum files and the vendor folder are updated to reflect this new govmomi dependency.

FYI, looks like the vendor folder also has some changes from previous updates.

Release note:

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ykakarap
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[k8s-ci-robot]

Hi @ykakarap. Thanks for your PR.

I'm waiting for a kubernetes-sigs or kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ykakarap]

I still need to sign the Contributor License Agreement. Having some issues with that.

[akutz]

Hi @ykakarap,

Please rebase this after running make vendor. That's how you update the project's vendored deps. It re-adds some required, non-Go assets pruned by Go modules.

[akutz]

/hold