support mutli images

[qixiaogang]

Change log description

Add image and volume array in the crd to support customize images deploy with zookeeper node.

Purpose of the change

Support multi images, issue: #228

What does the code do

This code allows users to add customized images and volumes in the pod spec, which means users can deploy other containers with the zookeeper.

To support multi containers, add containers and volumes to the manifest
spec: containers: # array of Container in k8s.io/api/core/v1 volumes: # array of Volume in k8s.io/api/core/v1

How to verify it

Create a ZookeeperCluster CR and add another image to the containers and define the volume in the volumes, then apply the ZookeeperCluster CR, you will find the zookeeper instance with start with the images define in the containers.

[codecov-commenter]

Codecov Report

Merging #230 into master will decrease coverage by 0.65%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
- Coverage   81.81%   81.16%   -0.66%     
==========================================
  Files          11       11              
  Lines        1248     1258      +10     
==========================================
  Hits         1021     1021              
- Misses        162      170       +8     
- Partials       65       67       +2     

Impacted Files	Coverage Δ
...g/apis/zookeeper/v1beta1/zookeepercluster_types.go	98.30% <ø> (ø)
...kg/apis/zookeeper/v1beta1/zz_generated.deepcopy.go	82.03% <0.00%> (-4.19%)	⬇️
pkg/zk/generators.go	98.31% <100.00%> (ø)

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[Prabhaker24]

@qixiaogang can you please add the steps for verification in the pr?

[qixiaogang]

@Prabhaker24 I doesn't get you about "the steps for verification in the PR", can you share more details?

and sorry for reply so late.

[qixiaogang]

@Prabhaker24 Can you help with above comments

[Prabhaker24]

@qixiaogang sorry I got busy with some other stuff. What I mean is you have removed the sections What the code does and How to verify from your pr description can you please add them back and explain what the code is doing there you can refer the following pr's description #215, Thanks.

[qixiaogang]

Thanks, get it.

[qixiaogang]

@Prabhaker24 Add the What the code does and How to verify back, please check

[Prabhaker24]

LGTM

[qixiaogang]

@anishakj Can you help to review the PR, thanks

[anishakj]

@qixiaogang Could you please add the new fields in https://github.com/pravega/zookeeper-operator/blob/master/charts/zookeeper/README.md, and https://github.com/pravega/zookeeper-operator/blob/master/charts/zookeeper/values.yaml

Also, since new parameters are added in spec ,CRD have to be changed to include the changes

[qixiaogang]

@anishakj Add new scripts in the two files and update the crd

[anishakj]

LGTM