Use correct redis service name on Ubuntu
Use correct redis service name on Ubuntu

Fixes ansible-tower service failure when [re]starting on Ubuntu systems.

Trello: https://trello.com/c/YLZM5SUH

wwitzel3/awx,wwitzel3/awx,snahelou/awx,wwitzel3/awx,snahelou/awx,snahelou/awx,wwitzel3/awx,snahelou/awx