provider/maas: minor cleanup of availability zone loop
provider/maas: minor cleanup of availability zone loop

bogdanteleaga/juju,dimitern/juju,tych0/juju,bz2/juju,bac/juju,mhilton/juju,macgreagoir/juju,mikemccracken/juju,mjs/juju,mjs/juju,bogdanteleaga/juju,marcoceppi/juju,tasdomas/juju,cmars/juju,frankban/juju-tmp,gabriel-samfira/juju,mikemccracken/juju,mhilton/juju-juju,sinzui/juju,perrito666/juju,frankban/juju-tmp,cmars/juju,gabriel-samfira/juju,marcmolla/juju,cloud-green/juju,thomnico/juju,davecheney/juju,frankban/juju,dooferlad/juju,wwitzel3/juju,howbazaar/juju,davecheney/juju,dooferlad/juju,howbazaar/juju,marcmolla/juju,mhilton/juju,gabriel-samfira/juju,ericsnowcurrently/juju,cloud-green/juju,marcmolla/juju,bogdanteleaga/juju,voidspace/juju,alesstimec/juju,fwereade/juju,marcoceppi/juju,reedobrien/juju,marcmolla/juju,Altoros/juju-vmware,alesstimec/juju,dooferlad/juju,macgreagoir/juju,marcoceppi/juju,cmars/juju,kat-co/juju,cherylj/juju,frankban/juju-tmp,bz2/juju,tsakas/juju,AdamIsrael/juju,ericsnowcurrently/juju,axw/juju,mjs/juju,kat-co/juju,dimitern/juju,macgreagoir/juju,perrito666/juju,sinzui/juju,tych0/juju,voidspace/juju,frankban/juju-tmp,cherylj/juju,Altoros/juju-cloudsigma,gabriel-samfira/juju,sinzui/juju,thomnico/juju,wwitzel3/juju,mjs/juju,voidspace/juju,AdamIsrael/juju,alesstimec/juju,voidspace/juju,Altoros/juju-cloudsigma,davecheney/juju,thomnico/juju,frankban/juju,mjs/juju,marcoceppi/juju,wwitzel3/juju,gabriel-samfira/juju,anastasiamac/juju,mhilton/juju-juju,macgreagoir/juju,dooferlad/juju,tasdomas/juju,ericsnowcurrently/juju,waigani/juju,fwereade/juju,Altoros/juju-cloudsigma,tsakas/juju,kat-co/juju,kat-co/juju,perrito666/juju,bac/juju,anastasiamac/juju,howbazaar/juju,fwereade/juju,dooferlad/juju,waigani/juju,howbazaar/juju,mikemccracken/juju,axw/juju,mjs/juju,axw/juju,cloud-green/juju,ericsnowcurrently/juju,dimitern/juju,howbazaar/juju,tsakas/juju,bz2/juju,makyo/juju,thomnico/juju,bac/juju,axw/juju,frankban/juju,cherylj/juju,cloud-green/juju,mhilton/juju,reedobrien/juju,mhilton/juju-juju,perrito666/juju,AdamIsrael/juju,mikemccracken/juju,bz2/juju,tych0/juju,wwitzel3/juju,davecheney/juju,reedobrien/juju,sinzui/juju,tasdomas/juju,frankban/juju,bac/juju,bogdanteleaga/juju,mhilton/juju-juju,dimitern/juju,anastasiamac/juju,cmars/juju,makyo/juju,Altoros/juju-cloudsigma,AdamIsrael/juju,fwereade/juju,mikemccracken/juju,alesstimec/juju,perrito666/juju,macgreagoir/juju,alesstimec/juju,tasdomas/juju,makyo/juju,cherylj/juju,tsakas/juju,bz2/juju,dimitern/juju,anastasiamac/juju,makyo/juju,waigani/juju,Altoros/juju-vmware,reedobrien/juju,marcmolla/juju,bac/juju,mjs/juju,anastasiamac/juju,Altoros/juju-vmware,frankban/juju,kat-co/juju,mhilton/juju,waigani/juju,reedobrien/juju,ericsnowcurrently/juju,tych0/juju,Altoros/juju-vmware,axw/juju