Fix creation of multiple storage classes in Helm chart

[NilsGriebner]

Is this a bug fix or adding new feature?
This is a bug fix for #387

What is this PR about? / Why do we need it?
The PR adds yaml separators to the storageclass template, so that helm can create all storageclasses specified
in values.yaml

What testing is done?
Applied the changed chart against my local k8s cluster. The outcome was

# Source: aws-efs-csi-driver/templates/storageclass.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: efs-sc1
provisioner: efs.csi.aws.com
parameters:
  directoryPerms: "700"
  fileSystemId: 123
  provisioningMode: efs-ap
---
# Source: aws-efs-csi-driver/templates/storageclass.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: efs-sc2
provisioner: efs.csi.aws.com
parameters:
  directoryPerms: "700"
  fileSystemId: 345
  provisioningMode: efs-ap

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Hi @NilsGriebner. Thanks for your PR.

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[NilsGriebner]

CLA signed

[wongma7]

/lgtm
/approve

thanks!

I will cherry-pick this into the release-1.2 branch for inclusion in a 1.2.x helm chart later, unless you wish to do it.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: NilsGriebner, wongma7

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[NilsGriebner]

/lgtm
/approve

thanks!

I will cherry-pick this into the release-1.2 branch for inclusion in a 1.2.x helm chart later, unless you wish to do it.

Thanks for your quick response. Feel free to pick it!