pkg/runtime: optimize FDUsage by removing sort
pkg/runtime: optimize FDUsage by removing sort

No need sort when we just want the counts.

Signed-off-by: Gyuho Lee <0fbd30d364d71722b926950b451cecd97b54fc29@amazon.com>

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