hack: fix cherrypick instruction
hack: fix cherrypick instruction

Remotes is not a valid git command. Also, set the environmental variable
correctly.

rnaveiras/etcd,ajityagaty/etcd,mkumatag/etcd,mqliang/etcd,rnaveiras/etcd,gyuho/etcd,mkumatag/etcd,etcd-io/etcd,dannysauer/etcd,etcd-io/etcd,ajityagaty/etcd,li-ang/etcd,mqliang/etcd,ajityagaty/etcd,etcd-io/etcd,rnaveiras/etcd,cockroachdb/etcd,mkumatag/etcd,li-ang/etcd,gyuho/etcd,mqliang/etcd,coreos/etcd,coreos/etcd,dannysauer/etcd,cockroachdb/etcd