Fix floaty list --active for vmpooler api v2

[yachub]

Fixes list --active command, which was not updated for vmpooler api v2. If a vmpooler service URL in ~/.vmfloaty.yml ended with /api/v2, the following output was observed:

> floaty list --active
Your VMs on vmpooler.example.com:
- spicy-proton. (running, fedora-36-x86_64, 6.23/12 hours)

This will now correctly report:

> floaty list --active
Your VMs on vmpooler.example.com:
- spicy-proton.vmpooler.example.com (running, fedora-36-x86_64, 6.89/12 hours)

[e-gris]

Wholly optional, current style preference would be

# For backwards compatibility with vmpooler api v1

message = if host_data['domain']
            "- #{hostname}.#{host_data['domain']} (#{metadata.join(', ')})"
              .gsub(/^/, ' ' * indent)
          else
            "- #{host_data['fqdn']} (#{metadata.join(', ')})"
              .gsub(/^/, ' ' * indent)
        end