Fix timing issue in collect manifold test.
Fix timing issue in collect manifold test.

Because this manifold starts a periodic worker, that worker may show an
error exit if not set up with a mock.

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