state: removed fragile timing assumptions in allwatcher tests
state: removed fragile timing assumptions in allwatcher tests

testWatcher.All() was assuming that deltas would returned with
ShortWait, if there were delta available. This is fragile and is
especially not true with allEnvWatcherStateBacking where State
connections may have to be established (this can take a while). The
tests were failing on the slower CI hosts.

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