Description of problem:

When trying to create a host-registration script with an unlimited life time using hammer, it complains about the parameter not being numeric (it's possible to set that generate that same script with unlimited life time through the web UI):

```

1. hammer host-registration generate-command --organization-id 1 --activation-key $AK --jwt-expiration unlimited --insecure true --force true
   Failed to generate registration command:
   Error: Option '--jwt-expiration': Numeric value is required..

See: 'hammer host-registration generate-command --help'.
```

Version-Release number of selected component (if applicable):

Satellite 6.13 Snap 15

How reproducible:

Always.

Steps to Reproduce:
1.
2.
3.

Actual results:

Host registration command is not generated.

Expected results:

Host registration command should be generated with an unlimited JWT life time.

Additional info: