Add the 'timezone' requirement to the Portus rpm
Add the 'timezone' requirement to the Portus rpm

On a really minimal system (e.g. a Docker image) the timezone package
is usually missing, that would cause some rubygem to fail.

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