vmdkops-admin-cli-spec.md needs update to reflect new Tenants design

[msterin]

it currently says

# tenant
Create, delete, configure and show access control settings for a Tenant.
A tenant is defined as a collection of VMs, so access control settings are assigned via a
VM naming convention.
*** The rest of section below needs rework as it represents obsolete "role" design ***

We need to update the doc to match the design/implementation

[kerneltime]

The public facing admin cli spec is https://github.com/vmware/docker-volume-vsphere/blob/master/docs/user-guide/admin-cli.md posted here https://vmware.github.io/docker-volume-vsphere/user-guide/admin-cli/ This needs to be updated. https://github.com/vmware/docker-volume-vsphere/blob/master/docs/misc/vmdkops-admin-cli-spec.md needs to be deprecated.

[pdhamdhere]

@kerneltime Close?