mvcc: remove stopc select case in Hash
mvcc: remove stopc select case in Hash

Revert change in https://github.com/coreos/etcd/pull/7105/commits/33acbb694b81f0d4a254936195d706a0b29ce158.

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

visheshnp/etcd,etcd-io/etcd,YuleiXiao/etcd,mqliang/etcd,coreos/etcd,sinsharat/etcd,armstrongli/etcd,glevand/coreos--etcd,mkumatag/etcd,coreos/etcd,sebrandon1/etcd,plasticbox/etcd,bdarnell/etcd,yudai/etcd,bluebreezecf/etcd,dannysauer/etcd,mkumatag/etcd,plasticbox/etcd,rnaveiras/etcd,xiang90/etcd,mkumatag/etcd,visheshnp/etcd,cockroachdb/etcd,yudai/etcd,a-robinson/etcd,YuleiXiao/etcd,ajityagaty/etcd,ajityagaty/etcd,bdarnell/etcd,joshix/etcd,dannysauer/etcd,heyitsanthony/etcd,joshix/etcd,sinsharat/etcd,whuwxl/etcd,rnaveiras/etcd,bluebreezecf/etcd,akauppi/etcd,glevand/coreos--etcd,ajityagaty/etcd,sebrandon1/etcd,mickep76/etcd,xiang90/etcd,lorneli/etcd,gyuho/etcd,armstrongli/etcd,lorneli/etcd,heyitsanthony/etcd,vimalk78/etcd,akauppi/etcd,vimalk78/etcd,mqliang/etcd,whuwxl/etcd,li-ang/etcd,gyuho/etcd,rnaveiras/etcd,mickep76/etcd,a-robinson/etcd,fanminshi/etcd,etcd-io/etcd,fanminshi/etcd,mqliang/etcd,li-ang/etcd,cockroachdb/etcd,etcd-io/etcd