[r=wallyworld] Attempt to make replicaset tests robust
[r=wallyworld] Attempt to make replicaset tests robust

The repliaset tests were creating a mongo instance
for the suite and cleaning up replicas etc between
tests. This branch changes that to set up a new
instance for each test. A bunch of cleanup code can
then be removed and there will be better isolation
between tests. This may hopefully help with some
of the intermittent replicaset test failures.

https://codereview.appspot.com/101780043/
Altoros/juju-cloudsigma,marcoceppi/juju,mikemccracken/juju,cmars/juju,frankban/juju,makyo/juju,cloud-green/juju,jrwren/juju,tasdomas/juju,kat-co/juju,cherylj/juju,bac/juju,perrito666/juju,frankban/juju-tmp,cherylj/juju,cmars/juju,marcmolla/juju,frankban/juju,mikemccracken/juju,mattyw/juju,davecheney/juju,Altoros/juju-vmware,kat-co/juju,frankban/juju,marcmolla/juju,bogdanteleaga/juju,reedobrien/juju,reedobrien/juju,thomnico/juju,ericsnowcurrently/juju,dooferlad/juju,mikemccracken/juju,tsakas/juju,frobware/juju,sinzui/juju,mattyw/juju,anastasiamac/juju,bac/juju,frankban/juju-tmp,axw/juju,alesstimec/juju,alesstimec/juju,thomnico/juju,dooferlad/juju,howbazaar/juju,fwereade/juju,mjs/juju,voidspace/juju,howbazaar/juju,frankban/juju-tmp,cherylj/juju,rogpeppe/juju,makyo/juju,AdamIsrael/juju,gabriel-samfira/juju,cherylj/juju,tych0/juju,Altoros/juju-cloudsigma,cmars/juju,gabriel-samfira/juju,perrito666/juju,macgreagoir/juju,dooferlad/juju,axw/juju,ericsnowcurrently/juju,bac/juju,davecheney/juju,AdamIsrael/juju,wwitzel3/juju,bac/juju,howbazaar/juju,bogdanteleaga/juju,mjs/juju,reedobrien/juju,marcmolla/juju,sinzui/juju,mattyw/juju,rogpeppe/juju,dooferlad/juju,davecheney/juju,mhilton/juju-juju,tych0/juju,wwitzel3/juju,kat-co/juju,macgreagoir/juju,kat-co/juju,tsakas/juju,tych0/juju,anastasiamac/juju,mhilton/juju-juju,alesstimec/juju,thomnico/juju,macgreagoir/juju,macgreagoir/juju,marcoceppi/juju,sinzui/juju,tsakas/juju,gabriel-samfira/juju,frankban/juju,bz2/juju,jrwren/juju,Altoros/juju-vmware,waigani/juju,alesstimec/juju,mhilton/juju,marcmolla/juju,AdamIsrael/juju,tasdomas/juju,wwitzel3/juju,mjs/juju,ericsnowcurrently/juju,bogdanteleaga/juju,davecheney/juju,fwereade/juju,waigani/juju,bogdanteleaga/juju,mhilton/juju,ericsnowcurrently/juju,tasdomas/juju,mikemccracken/juju,Altoros/juju-vmware,anastasiamac/juju,mhilton/juju-juju,Altoros/juju-cloudsigma,frankban/juju,jrwren/juju,fwereade/juju,frobware/juju,bac/juju,wwitzel3/juju,Altoros/juju-cloudsigma,cloud-green/juju,anastasiamac/juju,mhilton/juju-juju,voidspace/juju,cmars/juju,mjs/juju,bz2/juju,bz2/juju,thomnico/juju,anastasiamac/juju,dimitern/juju,cloud-green/juju,mhilton/juju,perrito666/juju,marcoceppi/juju,dimitern/juju,makyo/juju,mhilton/juju,ericsnowcurrently/juju,reedobrien/juju,dimitern/juju,mjs/juju,howbazaar/juju,bz2/juju,cloud-green/juju,perrito666/juju,kat-co/juju,waigani/juju,fwereade/juju,perrito666/juju,voidspace/juju,gabriel-samfira/juju,rogpeppe/juju,alesstimec/juju,axw/juju,tsakas/juju,mjs/juju,dimitern/juju,macgreagoir/juju,tych0/juju,gabriel-samfira/juju,tasdomas/juju,bz2/juju,mattyw/juju,dooferlad/juju,reedobrien/juju,marcmolla/juju,howbazaar/juju,mikemccracken/juju,mjs/juju,axw/juju,marcoceppi/juju,Altoros/juju-vmware,frobware/juju,frankban/juju-tmp,makyo/juju,AdamIsrael/juju,axw/juju,sinzui/juju,waigani/juju,dimitern/juju,voidspace/juju