fix double packaging bug
fix double packaging bug

modifying the constant for packaging types caused duplicates in the
array which would cause the rake task generator code to run multiple
times, which somehow caused us to create each package twice.

ashhher3/omnibus,chef/omnibus,rhass/omnibus,jamesn/omnibus,sh9189/omnibus,szechyjs/omnibus,3ofcoins/chef-omnibus,DataDog/omnibus-ruby,Altiscale/omnibus,mattray/omnibus,jamesn/omnibus,3ofcoins/chef-omnibus,szechyjs/omnibus,DataDog/omnibus-ruby,rapid7/omnibus,Scalr/omnibus,rhass/omnibus,sh9189/omnibus,ashhher3/omnibus,sh9189/omnibus,lvfeng1130/omnibus,hugosato/omnibus,DataDog/omnibus-ruby,ashhher3/omnibus,pskrz/omnibus,servebox/omnibus,adamleff/omnibus,hugosato/omnibus,jamesn/omnibus,servebox/omnibus,higanworks/omnibus,Scalr/omnibus,chef/omnibus,strangelittlemonkey/omnibus,chef/omnibus,adamleff/omnibus,higanworks/omnibus,intfrr/omnibus,Altiscale/omnibus,intfrr/omnibus,rapid7/omnibus,Scalr/omnibus,Altiscale/omnibus,mattray/omnibus,szechyjs/omnibus,3ofcoins/chef-omnibus,rapid7/omnibus,servebox/omnibus,lvfeng1130/omnibus,lvfeng1130/omnibus,higanworks/omnibus,adamleff/omnibus,hugosato/omnibus,pskrz/omnibus,strangelittlemonkey/omnibus,pskrz/omnibus,rhass/omnibus,mattray/omnibus,strangelittlemonkey/omnibus,intfrr/omnibus