Commits on Jun 7, 2019

1. Provide default images and volume mounts to user-provided init contai… …

   …ners.
   
   This makes the user-provided init containers run after our built-ins,
   meaning the user-provided init containers gets the final say on what
   the environment is going to look like.
   
   It defaults the init container image to the ES container image for convenience.
   
   The Volume mounts for the ES container is appended to the init containers
   volume mounts, with the result being that a simple init container will
   run in the same context as Elasticsearch (with a notable exception of
   environment variables)
   
   This change facilitates use cases such as installing custom plugins:
   
   ```yaml
   apiVersion: elasticsearch.k8s.elastic.co/v1alpha1
   kind: Elasticsearch
   metadata:
     name: elasticsearch-sample
   spec:
     version: "7.1.0"
     nodes:
     - podTemplate:
         spec:
           initContainers:
           - name: install-plugins
             command:
             - sh
             - -c
             - |
               bin/elasticsearch-plugin install --batch repository-azure
       nodeCount: 1
   ```

   

   nkvoll committed Jun 7, 2019
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