Converted some tests to use unit generators
Converted some tests to use unit generators

R=bcsaller, matthew.scott
CC=
https://codereview.appspot.com/8331043

bac/juju-gui,jrwren/juju-gui,bac/juju-gui,mitechie/juju-gui,mitechie/juju-gui,CanonicalJS/juju-gui,CanonicalJS/juju-gui,bac/juju-gui,bac/juju-gui,jrwren/juju-gui,jrwren/juju-gui,mitechie/juju-gui,mitechie/juju-gui,jrwren/juju-gui,CanonicalJS/juju-gui