#1306 added ability to list virtual guests on hardware servers, which is great, but I think this feature should be hidden behind a flag, instead of default.

slcli vs list --all should list everything (current behavior )
slcli vs list --hardware should list all guests on hardware servers
slcli vs list should list only normal virtual guests

Also, update the table header from
Hardware(id = 479564) guests associated
to
Hostname.domain.com Guests