Fix: Spark role binding did not render properly when setting spark service account name

[ChenYi015]

Purpose of this PR

Close #2134

Proposed changes:

• Fix roleRef in Spark role binding

Change Category

Indicate the type of change by marking the applicable boxes:

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

roleRef in Spark role binding did not refer to the correct Spark role name. Thus, driver pod failed to create executor pods:

Caused by: io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: GET at: https://kubernetes.default.svc/api/v1/namespaces/bladerunner/pods/xxx-driver. Message: Forbidden!Configured service account doesn't have access. Service account may have been revoked. pods "xxx" is forbidden: User "system:serviceaccount:test:spark-sa" cannot get resource "pods" in API group "" in the namespace "test": RBAC: role.rbac.authorization.k8s.io "spark-sa" not found.

Checklist

Before submitting your PR, please review the following:

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

Additional Notes

[ChenYi015]

/assign @vara-bonthu @yuchaoran2011

[vara-bonthu]

/lgtm

[google-oss-prow]

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