Make 'compose-setup' more robust
Make 'compose-setup' more robust

Do not rely on the `HOST` environment variable.

Fixes issue #304

angry-tony/Portus-20170827,SUSE/Portus,SUSE/Portus,angry-tony/Portus-20170827,SUSE/Portus,bencevans/Portus,SUSE/Portus,bencevans/Portus,jloehel/Portus,krishnak9/Portus,kwk/Portus,angry-tony/Portus-20170827,mssola/Portus,thuongdinh/Portus,krishnak9/Portus,vpereira/Portus,armbuilds/portus,kwk/Portus,thuongdinh/Portus,vpereira/Portus,morodin/Portus,morodin/Portus,jloehel/Portus,mssola/Portus,bencevans/Portus,thuongdinh/Portus,mssola/Portus,armbuilds/portus,vpereira/Portus,jloehel/Portus,morodin/Portus,krishnak9/Portus,kwk/Portus,mssola/Portus,armbuilds/portus,angry-tony/Portus-20170827,krishnak9/Portus