Update RUT helmchart values (#1053)

Make redis user non-required since on some deployments we don't use it
Configure replica count with ENV

This is done withing preparations to move RUT to internal Kubernetes
cluster

Related Issue(s):
* #1052

Author: YuryHrytsuk

charts/simcore-charts/resource-usage-tracker/values.yaml.gotmpl

@@ -2,7 +2,7 @@
 # This is a YAML-formatted file.
 # Declare variables to be passed into your templates.
 
-replicaCount: 1
+replicaCount: {{ requiredEnv "RESOURCE_USAGE_TRACKER_KUBERNETES_REPLICAS" }}
 
 image:
   repository: '{{  .Values | get "DOCKER_REGISTRY" "itisfoundation" }}/resource-usage-tracker'
@@ -133,7 +133,7 @@ env:
   - name: RABBIT_USER
     value: {{ requiredEnv "RABBIT_USER" }}
   - name: REDIS_USER
-    value: {{ requiredEnv "REDIS_USER" }}
+    value: {{ env "REDIS_USER" }}
   - name: REDIS_HOST
     value: {{ requiredEnv "REDIS_EXTERNAL_HOST" }}
   - name: REDIS_PORT