X z6001 localhost time with C-states >C1 disabled

It improves a lot:

ZEO:             ~660μs ->  ~490μs
NEO/pylite:      ~750μs ->  ~470μs      (Cpy)
NEO/pylite:      ~500μs ->  ~370μs      (Cgo)
NEO/pysql:      ~1450μs ->  ~780μs      (Cpy)
NEO/pysql:      ~1000μs ->  ~670μs      (Cgo)
NEO/go:          ~450μs ->  ~280μs      (Cpy)
NEO/go:           ~90μs ->   ~80μs      (Cgo)
NEO/go-nosha1:    ~60μs ->   ~55μs