(PDB-1653) Add response-mult to the dispatcher
(PDB-1653) Add response-mult to the dispatcher

This is a mult on the channel that gets all the response messages, not
partitioned by topic.

Also removes the field from the response messages, as it is not needed
and could lead to memory issues.

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