Merge branch 'update_eck_to_1.3.1' into 'development'

Update ECK to 1.3.1

See merge request !9

Jenkinsfile

 @Library('DCCSCR@master') _
-dccscrPipeline(version: '1.3.0')
+dccscrPipeline(version: '1.3.1')
 
 /* The above format is required for all production submissions.  
 *  The version will be the image tag associated with this container for this branch.

README.md

@@ -29,4 +29,4 @@ We recommend a minimum of 150Mi of RAM and 100m CPU. Larger Kubernetes clusters
 
 ## Startup requirements
 
-This image requires a valid kubeconfig and an `OPERATOR_NAMESPACE` environment variable to start successfully. Please see the StatefulSet manifest in [the default distribution](https://download.elastic.co/downloads/eck/1.3.0/all-in-one.yaml) for a recommended configuration.
+This image requires a valid kubeconfig and an `OPERATOR_NAMESPACE` environment variable to start successfully. Please see the StatefulSet manifest in [the default distribution](https://download.elastic.co/downloads/eck/1.3.1/all-in-one.yaml) for a recommended configuration.

download.json

 {
   "resources": [
     {
-      "url": "https://download.elastic.co/downloads/eck/1.3.0/elastic-operator",
+      "url": "https://download.elastic.co/downloads/eck/1.3.1/elastic-operator",
       "filename": "elastic-operator",
       "validation": {
         "type": "sha512",
-        "value": "ddc023cccc803d539309fc13e121aa9cddf6c26cf545c1326108520b3eb11ce8cabcd8f1be600172e306071e42fc2b03d0cce45cbf7b3ed43bad608f442074ec"
+        "value": "635f151b2acb27f4c025f55d7fbeade18f35a972c7c5c752b18d013913b66a4ad241c75a02c2343d1f015b398f8f855958cd2fb40909283332176f31081f33d4"
       }
     },
     {
-      "url": "https://download.elastic.co/downloads/eck/1.3.0/LICENSE.txt",
+      "url": "https://download.elastic.co/downloads/eck/1.3.1/LICENSE.txt",
       "filename": "LICENSE.txt",
       "validation": {
         "type": "sha512",
@@ -17,7 +17,7 @@
       }
     },
     {
-      "url": "https://download.elastic.co/downloads/eck/1.3.0/NOTICE.txt",
+      "url": "https://download.elastic.co/downloads/eck/1.3.1/NOTICE.txt",
       "filename": "NOTICE.txt",
       "validation": {
         "type": "sha512",