Fix the broken bzr test.
Fix the broken bzr test.

The TestCommit test in bzr/bzr_test.go assumes that the revision-id is shown
in the log output.  This is only the case if log has been aliased to include
the --show-ids flag.  This fix explicitly puts that option in the bzr command
to be executed.

R=dfc
CC=
https://codereview.appspot.com/8500043

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