Add murmurhash2 for ring hash load balancing. (#5492)
Add murmurhash2 for ring hash load balancing. (#5492)

Signed-off-by: Henry Yang <hyang@lyft.com>

Mirrored from https://github.com/envoyproxy/envoy @ d0bfc0e269b300584c052bb26e5f68fd1e7b9c72

lyft/envoy-api,lyft/envoy-api,lyft/envoy-api