[chart/redis-ha]probes for split brain container

[bn-mcoxall]

I would like to add liveness and readiness probes for the split brain container. something like

splitBrainDetection:
livenessProbe:
exec:
command:
- cat
- /readonly-config/redis.conf
initialDelaySeconds: 5
periodSeconds: 5
readinessProbe:
exec:
command:
- cat
- /readonly-config/redis.conf
initialDelaySeconds: 5
periodSeconds: 5