Upgrade pyvmomi to 7.0.2

[coignetp]

What does this PR do?

Needed to support vSphere 7

Motivation

First step for vsphere 7 support

Additional Notes

pyvmomi is used to communicate with the SOAP API.
As they suggest in their doc https://github.com/vmware/pyvmomi

Pyvmomi maintains minimum backward compatibility with the previous _four_ releases of vSphere and it's own previous four releases. Compatibility with much older versions may continue to work but will not be actively supported.

So it should work from vSphere 6.0

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached