Configuring CPU and memory limits for cluster logging components

1. apiVersion: "logging.openshift.io/v1"
   kind: "ClusterLogging"
   metadata:
     name: "instance"
   ....
   spec:
     managementState: "Managed"
     logStore:
       type: "elasticsearch"
       elasticsearch:
         nodeCount: 2
         resources: (1)
           limits:
             memory: 2Gi
           requests:
             cpu: 200m
         storage:
           storageClassName: "gp2"
           size: "200G"
         redundancyPolicy: "SingleRedundancy"
     visualization:
       type: "kibana"
       kibana:
         resources: (2)
           limits:
             memory: 1Gi
           requests:
             cpu: 500m
             memory: 1Gi
         proxy:
           resources: (2)
             limits:
               memory: 100Mi
             requests:
               cpu: 100m
     curation:
       type: "curator"
       curator:
         resources: (3)
           limits:
             memory: 200Mi
           requests:
             cpu: 200m
             memory: 200Mi
         schedule: "*/10 * * * *"
     collection:
       logs:
         type: "fluentd"
         fluentd:
           resources: (4)
             limits:
               memory: 736Mi
             requests:
               memory: 736Mi