Add test for all groups have a coordinator.
Add test for all groups have a coordinator.

Some ZoneGroups have no coordinator set.

simonalpha/SoCo,dajobe/SoCo,dsully/SoCo,SoCo/SoCo,intfrr/SoCo,fxstein/SoCo,xxdede/SoCo,fxstein/SoCo,bwhaley/SoCo,fgend31/SoCo,dundeemt/SoCo,petteraas/SoCo,KennethNielsen/SoCo,jlmcgehee21/SoCo,TrondKjeldas/SoCo,SoCo/SoCo,petteraas/SoCo,dundeemt/SoCo,dajobe/SoCo,meska/SoCo,TrondKjeldas/SoCo,flavio/SoCo,jlmcgehee21/SoCo,KennethNielsen/SoCo,fgend31/SoCo,meska/SoCo,bwhaley/SoCo,flavio/SoCo,DPH/SoCo,TrondKjeldas/SoCo,DPH/SoCo,bwhaley/SoCo,xxdede/SoCo,lawrenceakka/SoCo,simonalpha/SoCo,dsully/SoCo,petteraas/SoCo,xxdede/SoCo,lawrenceakka/SoCo,intfrr/SoCo