environs/bootstrap: use set.Strings
environs/bootstrap: use set.Strings

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