Missing `announce-ip` and `announce-port` options for Redis/Sentinel
When running in a Docker environment using the default GitLab images which are based in omnibus-gitlab, the announce-ip
and announce-port
options are needed to implement a HA redis cluster. Without them, the port/ip remapping done by Docker makes Redis master do not discover properly the slaves and Sentinels do not talk correctly to each other. The technical details are documented in https://redis.io/topics/replication#configuring-replication-in-docker-and-nat and https://redis.io/topics/replication#configuring-replication-in-docker-and-nat
A merge request implementing these options is available in !1211