cmd: Fix logging
cmd: Fix logging

`%#v` gives in output:
   Initializing server failed: &errors.errorString{s:"unable to connect to server at 'libvirt:16509': Connection refused"}
`%v` gives:
   Initializing server failed: unable to connect to server at 'libvirt:16509': Connection refused

nhlfr/virtlet,nhlfr/virtlet,vefimova/virtlet,vefimova/virtlet,vefimova/virtlet,vefimova/virtlet,nhlfr/virtlet,Mirantis/virtlet,Mirantis/virtlet,nhlfr/virtlet