Support: cluster_config for satellite clusters

[kavya498]

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Relates OR Closes #0000

Output from acceptance testing:

=== RUN   TestAccIBMContainer_ClusterConfigDataSourceBasic
2021/05/13 11:33:09 Configuring SoftLayer Session with API key
2021/05/13 11:33:09 Configuring IBM Cloud Session with API key
2021/05/13 11:33:09 [INFO] Configured Region: us-south
2021/05/13 11:33:15 Configuring SoftLayer Session with API key
2021/05/13 11:33:15 Configuring IBM Cloud Session with API key
2021/05/13 11:33:15 [INFO] Configured Region: us-south
2021/05/13 11:33:18 Configuring SoftLayer Session with API key
2021/05/13 11:33:18 Configuring IBM Cloud Session with API key
2021/05/13 11:33:18 [INFO] Configured Region: us-south
2021/05/13 11:33:20 Configuring SoftLayer Session with API key
2021/05/13 11:33:20 Configuring IBM Cloud Session with API key
2021/05/13 11:33:20 [INFO] Configured Region: us-south
2021/05/13 11:33:23 Configuring SoftLayer Session with API key
2021/05/13 11:33:23 Configuring IBM Cloud Session with API key
2021/05/13 11:33:23 [INFO] Configured Region: us-south
2021/05/13 11:33:30 Configuring SoftLayer Session with API key
2021/05/13 11:33:30 Configuring IBM Cloud Session with API key
2021/05/13 11:33:30 [INFO] Configured Region: us-south
2021/05/13 11:33:32 Configuring SoftLayer Session with API key
2021/05/13 11:33:32 Configuring IBM Cloud Session with API key
2021/05/13 11:33:32 [INFO] Configured Region: us-south
--- PASS: TestAccIBMContainer_ClusterConfigDataSourceBasic (26.62s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm	29.392s

terraform show

data "ibm_container_cluster_config" "cluster_foo" {
    admin             = false
    admin_certificate = (sensitive value)
    admin_key         = (sensitive value)
    ca_certificate    = (sensitive value)
    cluster_name_id   = "c27p2ahw01r2v51o295g"
    config_dir        = "/Users/kavya"
    config_file_path  = "/Users/kavya/ff5c2bb709388ac680f7c30b3ad5a595590caaad279f33c5997a821f32b70e0a_c27p2ahw01r2v51o295g_k8sconfig/config.yml"
    download          = true
    host              = "https://c-03.private.us-east.link.satellite.cloud.ibm.com:33684"
    id                = "c27p2ahw01r2v51o295g"
    network           = false
}