Update packs.unload action to also delete SensorType, TriggerType and Trigger db objects for the pack which is being removed.
Update packs.unload action to also delete SensorType, TriggerType and Trigger
db objects for the pack which is being removed.

Itxaka/st2,grengojbo/st2,grengojbo/st2,StackStorm/st2,grengojbo/st2,lakshmi-kannan/st2,StackStorm/st2,emedvedev/st2,pinterb/st2,StackStorm/st2,Plexxi/st2,pixelrebel/st2,peak6/st2,alfasin/st2,tonybaloney/st2,jtopjian/st2,pinterb/st2,Plexxi/st2,pinterb/st2,dennybaa/st2,dennybaa/st2,lakshmi-kannan/st2,nzlosh/st2,jtopjian/st2,tonybaloney/st2,Plexxi/st2,Itxaka/st2,emedvedev/st2,armab/st2,pixelrebel/st2,emedvedev/st2,lakshmi-kannan/st2,peak6/st2,punalpatel/st2,armab/st2,dennybaa/st2,tonybaloney/st2,alfasin/st2,nzlosh/st2,Plexxi/st2,armab/st2,nzlosh/st2,jtopjian/st2,nzlosh/st2,punalpatel/st2,StackStorm/st2,punalpatel/st2,alfasin/st2,peak6/st2,pixelrebel/st2,Itxaka/st2