[r=dimitern] api/uniter: Improve tests readability
[r=dimitern] api/uniter: Improve tests readability

Trivial change to rename suite's unit field
to stateUnit and the uniter.Unit proxy object
received through the API to apiUnit (in each
test case), as suggested online.

https://codereview.appspot.com/13472043/

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