fix a test by making sure we run precheckinstance.. also factored out the logic for converting an instance.Placement into the magic string that provicers want
fix a test by making sure we run precheckinstance.. also factored out the logic for converting an instance.Placement into the magic string that provicers want

gabriel-samfira/juju,howbazaar/juju,davecheney/juju,fwereade/juju,makyo/juju,bac/juju,alesstimec/juju,gabriel-samfira/juju,ericsnowcurrently/juju,bogdanteleaga/juju,davecheney/juju,axw/juju,kat-co/juju,mjs/juju,axw/juju,ericsnowcurrently/juju,frankban/juju,marcmolla/juju,macgreagoir/juju,dimitern/juju,fwereade/juju,mjs/juju,mjs/juju,howbazaar/juju,makyo/juju,perrito666/juju,ericsnowcurrently/juju,wwitzel3/juju,makyo/juju,wwitzel3/juju,perrito666/juju,alesstimec/juju,anastasiamac/juju,dooferlad/juju,wwitzel3/juju,dimitern/juju,waigani/juju,reedobrien/juju,anastasiamac/juju,marcmolla/juju,mjs/juju,dimitern/juju,bac/juju,bz2/juju,bac/juju,gabriel-samfira/juju,AdamIsrael/juju,macgreagoir/juju,AdamIsrael/juju,macgreagoir/juju,bz2/juju,reedobrien/juju,AdamIsrael/juju,ericsnowcurrently/juju,wwitzel3/juju,alesstimec/juju,reedobrien/juju,waigani/juju,dimitern/juju,mjs/juju,dimitern/juju,dooferlad/juju,frankban/juju,gabriel-samfira/juju,howbazaar/juju,macgreagoir/juju,waigani/juju,kat-co/juju,perrito666/juju,anastasiamac/juju,bz2/juju,bogdanteleaga/juju,alesstimec/juju,reedobrien/juju,macgreagoir/juju,mikemccracken/juju,dooferlad/juju,bz2/juju,anastasiamac/juju,frankban/juju,mikemccracken/juju,AdamIsrael/juju,davecheney/juju,voidspace/juju,bogdanteleaga/juju,fwereade/juju,anastasiamac/juju,davecheney/juju,marcmolla/juju,bac/juju,mjs/juju,voidspace/juju,kat-co/juju,howbazaar/juju,perrito666/juju,marcmolla/juju,makyo/juju,howbazaar/juju,mikemccracken/juju,frankban/juju,marcmolla/juju,fwereade/juju,kat-co/juju,alesstimec/juju,axw/juju,bz2/juju,mikemccracken/juju,reedobrien/juju,bac/juju,axw/juju,voidspace/juju,frankban/juju,mikemccracken/juju,waigani/juju,kat-co/juju,gabriel-samfira/juju,ericsnowcurrently/juju,bogdanteleaga/juju,mjs/juju,dooferlad/juju,perrito666/juju,dooferlad/juju,axw/juju,voidspace/juju