[BUG][Opensearch] Invalid volume permissions plus securityConfigSecrets

[alborotogarcia]

Describe the bug
A clear and concise description of what the bug is.
Failed to mount multiple secrets at once from securityConfigSecrets.config.data plus volume permissions
To Reproduce
Steps to reproduce the behavior:

1. Having set

  enabled: true
  path: "/usr/share/opensearch/plugins/opensearch-security/securityconfig"
  actionGroupsSecret:
  configSecret:
  internalUsersSecret:
  rolesSecret:
  rolesMappingSecret:
  tenantsSecret:
  #The following option simplifies securityConfig by using a single secret and specifying the respective secrets in the corresponding files instead of creating different secrets for config,internal users, roles, roles mapping and tenants
  #Note that this is an alternative to the above secrets and shouldn't be used if the above secrets are used
  config:
    securityConfigSecret: mysecret
    data:
         config.yml: |-

Returns the following:

helm.go:88: [debug] error converting YAML to JSON: yaml: invalid map key: map[interface {}]interface {}{".Chart.Name":interface {}(nil)}```

After applying a few fixes at opensearch/templates/securityconfig.yaml

It shows the following:
```opensearch-cluster-master-1 opensearch [2021-09-08T05:44:38,943][INFO ][o.o.p.PluginsService     ] [opensearch-cluster-master-1] loaded plugin [opensearch-sql]
opensearch-cluster-master-1 opensearch [2021-09-08T05:44:39,058][INFO ][o.o.s.OpenSearchSecurityPlugin] [opensearch-cluster-master-1] Disabled https compression by default to mitigate BREACH attacks. You can enable it by setting 'http.compression: true' in opensearch.yml
opensearch-cluster-master-1 opensearch [2021-09-08T05:44:39,613][ERROR][o.o.b.OpenSearchUncaughtExceptionHandler] [opensearch-cluster-master-1] uncaught exception in thread [main]
opensearch-cluster-master-1 opensearch org.opensearch.bootstrap.StartupException: OpenSearchException[failed to bind service]; nested: AccessDeniedException[/usr/share/opensearch/data/nodes];

Due to fsgroup permissions..

Expected behavior
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Chart Name
Specify the Chart which is affected?
Opensearch
Screenshots
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Host/Environment (please complete the following information):

• Helm Version: [e.g. 3.x.x]
• Kubernetes Version: [e.g. 1.16.x]

Additional context
Add any other context about the problem here.

[peterzhuamazon]

@TheAlgo @smlx any idea on this issue here? Thanks.