Set log level for production env
Set log level for production env

This is required to get rid of a deprecation warning:
> DEPRECATION WARNING: You did not specify a `log_level` in
> `production.rb`. Currently, the default value for `log_level` is
> `:info` for the production environment and `:debug` in all other
> environments. In Rails 5 the default value will be unified to `:debug`
> across all environments. To preserve the current setting, add the
> following line to your `production.rb`:

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