Prepare documentation for how to use offline depot for software deployment on ESX

[kerneltime]

VC, image builder have options for how to include offline depots for software deployment for ESX. Include quick steps and references to documentation to github after testing.

[tusharnt]

@kerneltime can you please elaborate what you meant here? Is this issue still relevant?

[tusharnt]

Here's a blog that explains how to use ESXi image builder for deploying VIBs - https://blogs.vmware.com/vsphere/2012/04/using-the-vsphere-esxi-image-builder-cli.html

We need to provide concrete steps for installing vDVS VIB by following the above info.

[govint]

This is closed via #1596