(maint) Remove unused dependency from export and cleanup syntax
(maint) Remove unused dependency from export and cleanup syntax

This commit removes the unused specter dependency from export.clj and
also uses a doseq for adding tar items to the tar-writer instead of a
complicated reduce.

grimradical/puppetdb,senior/puppetdb,waynr/puppetdb,mullr/puppetdb,waynr/puppetdb,rbrw/puppetdb,grimradical/puppetdb,kbarber/puppetdb,mullr/puppetdb,rbrw/puppetdb,grimradical/puppetdb,kbarber/puppetdb,wkalt/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,waynr/puppetdb,puppetlabs/puppetdb,senior/puppetdb,wkalt/puppetdb,senior/puppetdb,rbrw/puppetdb,kbarber/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,kbarber/puppetdb,wkalt/puppetdb,wkalt/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,senior/puppetdb,grimradical/puppetdb,waynr/puppetdb,mullr/puppetdb,puppetlabs/puppetdb