Cibadmin meta attributes to list

[arbulu89]

The meta_attributes entry can be there more than once (even though it looks like an exception, as entries finishing with s are unique).
This started happening in 15SP4 using ha-cluster-init tool to create the cluster.
So now the meta_attributes will be converted to a list always to avoid divergencies.

Example output:

[
  #{
    "id": "build-resource-defaults",
    "nvpair": [
      #{
        "id": "build-resource-stickiness",
        "name": "resource-stickiness",
        "value": 1
      }
    ]
  },
  #{
    "id": "rsc-options",
    "nvpair": [
      #{
        "id": "rsc-options-migration-threshold",
        "name": "migration-threshold",
        "value": 5000
      },
      #{
        "id": "rsc-options-resource-stickiness",
        "name": "resource-stickiness",
        "value": 1000
      }
    ]
  }
] 

[arbulu89]

Tested by @angelabriel