functional/tester: clean up "broadcastOperation"
functional/tester: clean up "broadcastOperation"

Signed-off-by: Gyuho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

xiang90/etcd,lorneli/etcd,rnaveiras/etcd,ajityagaty/etcd,ajityagaty/etcd,dannysauer/etcd,vimalk78/etcd,mkumatag/etcd,joshix/etcd,mqliang/etcd,li-ang/etcd,cockroachdb/etcd,mkumatag/etcd,coreos/etcd,bdarnell/etcd,coreos/etcd,etcd-io/etcd,mkumatag/etcd,gyuho/etcd,dannysauer/etcd,bdarnell/etcd,rnaveiras/etcd,mqliang/etcd,li-ang/etcd,glevand/coreos--etcd,lorneli/etcd,etcd-io/etcd,mqliang/etcd,sinsharat/etcd,ajityagaty/etcd,rnaveiras/etcd,fanminshi/etcd,etcd-io/etcd,fanminshi/etcd,sebrandon1/etcd,glevand/coreos--etcd,vimalk78/etcd,sinsharat/etcd,cockroachdb/etcd,xiang90/etcd,joshix/etcd,sebrandon1/etcd,gyuho/etcd