Fix go fmt errors.
Fix go fmt errors.

mongo/mongo.go was missing some whitespace and it
made go fmt sad (which prevented me from merging
wallyworld's PR:  https://github.com/juju/juju/pull/4715

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