refact(cspc): add schema for auxResource in poolConfig

[shubham14bajpai]

Signed-off-by: shubham [email protected]

What this PR does / why we need it:
This PR will add schema to pass auxResource limit to cStor pool pod side car containers via poolConfig.
The DefaultAuxResource is set if auxResource is not present in the poolConfig for the particular pool.

apiVersion: openebs.io/v1alpha1
kind: CStorPoolCluster
metadata:
  name: sparse-claim-auto
  namespace: openebs
spec:
  auxResources:
    requests:
      memory: "64Mi"
      cpu: "250m"
    limits:
      memory: "128Mi"
      cpu: "500m"
  pools:
  - nodeSelector:
      kubernetes.io/hostname: 127.0.0.1
    poolConfig:
      cacheFile: /tmp/sparse-claim-auto.cache
      compression: ""
      defaultRaidGroupType: mirror
      overProvisioning: false
      # AuxResources are applied to cstor-pool-mgmt and maya-exporter containers.  
      auxResources:
        requests:
           memory: "50Mi"
           cpu: "400m"
        limits:
          memory: "100Mi"
          cpu: "400m"
    raidGroups:
    - blockDevices:
      - blockDeviceName: sparse-37a7de580322f43a13338bf2467343f5
      - blockDeviceName: sparse-5a92ced3e2ee21eac7b930f670b5eab5
      isWriteCache: false
      isSpare: false

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Checklist:

• Fixes #
• Labelled this PR & related issue with documentation tag
• PR messages has document related information
• Labelled this PR & related issue with breaking-changes tag
• PR messages has breaking changes related information
• Labelled this PR & related issue with requires-upgrade tag
• PR messages has upgrade related information
• Commit has unit tests
• Commit has integration tests

[prateekpandey14]

lgtm

[sonasingh46]

lgtm

[vishnuitta]

are we trying NOT to use AuxResources of cspi.Spec? If so, better to remove from the struct itself

[shubham14bajpai]

getAuxResourceRequirement is used to populate the resourceRequirements for sidecar containers. The cspi is populated using either using the CSPC PoolConfig AuxResources or the DefaultAuxResources. If both of them are nil then an empty resourceRequirements needs to be set on the sidecar containers.