redis: use hiredis parser
redis: use hiredis parser

redis-py has a python and c parser[1]. install the c parser. it offers
~10%-90% performance improvement depending on task using benchmark from
redis-py[2].

[1] https://github.com/andymccurdy/redis-py#parsers
[2] https://github.com/andymccurdy/redis-py/blob/master/benchmarks/basic_operations.py

gnocchixyz/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi,sileht/gnocchi