Hammer CLI

Description of problem:
On, UI when we create a compute resource, there's a VM tab , where we can list all the VM's on that compute resource and can turn them ON/OFF

Steps to Reproduce:
1. On hammer , fire compoute-resource --help command
2. No command for listing VM's or manipulating their power
3.

Actual results:
Virtual-machine sub-command not present

Expected results:
We should have a sub-commands for listing VMs and turning them on/off

Additional info:

hammer> compute-resource --help
Usage:
     compute-resource [OPTIONS] SUBCOMMAND [ARG] ...

Parameters:
 SUBCOMMAND                    subcommand
 [ARG] ...                     subcommand arguments

Subcommands:
 create                        Create a compute resource
 delete                        Delete a compute resource
 image                         View and manage compute resource's images
 info                          Show a compute resource
 list                          List all compute resources
 update                        Update a compute resource

Options:
 -h, --help                    print help