apiserver/uniter: re-enable race tests
apiserver/uniter: re-enable race tests

Fixes LP 1518809

Re-enable race tests for this package, the underlying issues has been
solved.

perrito666/juju,axw/juju,gabriel-samfira/juju,ericsnowcurrently/juju,anastasiamac/juju,frankban/juju,kat-co/juju,mjs/juju,howbazaar/juju,mjs/juju,AdamIsrael/juju,marcmolla/juju,howbazaar/juju,mjs/juju,perrito666/juju,bz2/juju,mjs/juju,reedobrien/juju,reedobrien/juju,bac/juju,howbazaar/juju,mikemccracken/juju,bz2/juju,dimitern/juju,ericsnowcurrently/juju,dooferlad/juju,macgreagoir/juju,bz2/juju,bac/juju,anastasiamac/juju,AdamIsrael/juju,axw/juju,perrito666/juju,dooferlad/juju,mikemccracken/juju,macgreagoir/juju,dimitern/juju,ericsnowcurrently/juju,bac/juju,perrito666/juju,waigani/juju,alesstimec/juju,waigani/juju,anastasiamac/juju,frankban/juju,alesstimec/juju,reedobrien/juju,marcmolla/juju,dooferlad/juju,anastasiamac/juju,macgreagoir/juju,mikemccracken/juju,ericsnowcurrently/juju,AdamIsrael/juju,gabriel-samfira/juju,howbazaar/juju,mjs/juju,bac/juju,kat-co/juju,frankban/juju,dooferlad/juju,macgreagoir/juju,macgreagoir/juju,axw/juju,bac/juju,mikemccracken/juju,reedobrien/juju,alesstimec/juju,bz2/juju,mjs/juju,dimitern/juju,alesstimec/juju,anastasiamac/juju,dimitern/juju,gabriel-samfira/juju,mikemccracken/juju,waigani/juju,bz2/juju,axw/juju,kat-co/juju,mjs/juju,frankban/juju,perrito666/juju,waigani/juju,alesstimec/juju,gabriel-samfira/juju,gabriel-samfira/juju,marcmolla/juju,frankban/juju,kat-co/juju,dooferlad/juju,reedobrien/juju,ericsnowcurrently/juju,marcmolla/juju,AdamIsrael/juju,kat-co/juju,howbazaar/juju,marcmolla/juju,dimitern/juju,axw/juju