Fix bootstrap status cleanup
Fix bootstrap status cleanup

The cleanup of the provisioning status output wasn't accounting for the
3 extra characters prepended by the output function. This was leaving
the last characters of the provisioning output on the screen.

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