Support default resource of init container

[drivebyer]

ISSUE description:

1. create ns resource quota:

   apiVersion: v1
   kind: ResourceQuota
   metadata:
   name: quota-mcamel-system
   namespace: mcamel-system
   spec:
   hard:
   requests.cpu: "1"
   requests.memory: "1Gi"
   limits.cpu: "10"
   limits.memory: "20Gi"

2. create mysql cluster

pod does not craeted as expected, statefulset event shows:

Events:
   Type     Reason        Age                 From                    Message
   ----     ------        ----                ----                    -------
   Warning  FailedCreate  10m (x21 over 65m)  statefulset-controller  create Pod wy-mysql-1-mysql-0 in StatefulSet wy-mysql-1-mysql failed error: pods "wy-mysql-1-mysql-0" is forbidden: failed quota: quota-mcamel-system: must specify limits.cpu,limits.memory,requests.cpu,requests.memory

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• [x] I've made sure the CHANGELOG.md will remain up-to-date after this PR is merged.

[drivebyer]

@cndoit18 PTAL