lua-redisGet all hash values using hgetall

Usage example

local redis = (require 'redis').connect('127.0.0.1', 6379)
redis:hset('htst', 'a', '1')
redis:hset('htst', 'b', '2')
local values = redis:hgetall('htst')

for k,v in pairs(values) do
  print(k, v)
end

output

a   1
b   2