Install crc16 when redis is enabled
Install crc16 when redis is enabled

The current devstack script will only install crc16 for redis server.
However, it will fail the compute node using redis. The redis db drvier
needs crc16 [1], no matter if it is a redis server node.

[1] https://github.com/openstack/dragonflow/blob/master/dragonflow/db/drivers/redis_calckey.py

Change-Id: I7e9c07b700cf6b5b4dbd0ff9f8ae01a93b04ebe6
Related-bug: #1606457

openstack/dragonflow,openstack/dragonflow,openstack/dragonflow