[vsphere] Ensure clear user agent strings set for components calling to vSphere API

*USER STORY:*

 As a customer or OpenShift engineer, I want to see the user agent for anything calling from OpenShift -> vSphere to eliminate troubleshooting guesswork.

*DESCRIPTION:*

A question in #forum-vmware was raised where we identified that the user-agent may not be configured for all OpenShift components calling to vSphere API.

https://coreos.slack.com/archives/CH06KMDRV/p1627368902058800

*Required:*

Audit of OpenShift components calling to vSphere API to make sure user agent strings are set appropriately.

*Nice to have:*

How can this be prevented in the future? How can we minimize maintenance costs added by new PRs/bugs reported from this spike?

*ACCEPTANCE CRITERIA:*

New PRs or bug reports for each effected component.