Redis default values update (#1430)

I have set resource requests against each component part of redis and set the 'slaveCount' to 3 (as this actually sets the total number of pods and a minimum of 3 is required for a robust Redis Sentinel deployment, see: https://redis.io/topics/sentinel#fundamental-things-to-know-about-sentinel-before-deploying)

install/helm/open-match/values.yaml

@@ -118,16 +118,29 @@ redis:
     masterSet: om-redis-master
     port: 26379
     usePassword: false
+    resources:
+      requests:
+        memory: 300Mi
+        cpu: 0.5
   master:
     disableCommands: [] # don't disable 'FLUSH-' commands
     resources:
       requests:
         memory: 300Mi
         cpu: 0.5
+  slave:
+    resources:
+      requests:
+        memory: 300Mi
+        cpu: 0.5
   metrics:
     enabled: true
+    resources:
+      requests:
+        memory: 300Mi
+        cpu: 0.5
   cluster:
-    slaveCount: 2
+    slaveCount: 3
   serviceAccount:
     create: true
   sysctlImage: