Description of problem:
There are not default values for $ES_CA, $ES_CLIENT_KEY and $ES_CLIENT_CERT when the curator are deployed by cluster-logging-operator. the curator pod go into error.

Version-Release number of selected component (if applicable):
openshift/ose-cluster-logging-operator/images/v4.0.0-0.79.0.0"

How reproducible:
always

Steps to Reproduce:
1. deploy logging by cluster-logging-operator
EXCLUSIONS="10-service-monitor-fluentd.yaml 05-deployment.yaml image-references" cluster-logging-operator/hack/deploy-setup.sh
oc create -f cluster-logging-operator/05-deployment.yaml -n openshift-logging
oc create -f cluster-logging-operator/cluster-logging-operator/hack/examples/cr.yaml
2. set the curator interval 10 minute
   {"spec":{"curation":{"curator":{"schedule": "10/ * * * *"}}}}
3. Enable Debug Mode
   oc set env cronjob/curator CURATOR_LOG_LEVEL=debug 
   oc set env cronjob/curator CURATOR_SCRIPT_LOG_LEVEL=debug 

4. Waiting 10 minutes, and show the container logs


Actual results:
#oc logs curator-1543904400-npvkl
+ result=000
+ [[ 000 -eq 200 ]]
+ sleep 1
+ (( i++  ))
+ (( i<=60 ))
++ curl --cacert --key --cert -s -w '%{http_code}' -XGET https://elasticsearch:9200/ -o /dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (77) Problem with the SSL CA cert (path? access rights?)



Expected results:
There are default values for $ES_CA, $ES_CLIENT_KEY and $ES_CLIENT_CERT

Additional info: