Merge hardware and target.

[parauliya]

Now while creating a workflow you can directly provide hardware/devices mac addr.
And now there is no need of targets. This approach will support both single and multiple workers as well:

Current template look like this for worker field: ( Has the Target reference )

• worker: "{{index .Targets "machine1" "mac_addr"}}"

After this PR the template will look like this for worker field: (Target reference not required)

• worker: {{.device_1}}

Right Now the workflow create command is as follows for single and multiple worker: ( Has the Target reference )

• tink workflow create -t <temp-id> -r <target-id>

After this PR the workflow create command it will look like: ( Target reference not required )

1. For single worker
   tink workflow create -t <template_id> -r '{ "device_1": "mac/IP/Id" }'

2. For Multiple worker you can just increase the key value pair in the workflow create command:
   tink workflow create -t <template_id> -r '{ "device_1": "mac/IP", "device_2": "mac/IP"}'

Note: In the above case user can replace the keys device_1/device_2 with any name which should contain only letters, numbers and Underscore and should be in sync with template.

[mmlb]

lgtm

[alexellis]

Does this mean that the target creation is no longer required?