drEnablement has resources dependent on themselves

[drEnablement](https://github.com/Azure/azure-quickstart-templates/blob/master/azmgmt-demo/nestedtemplates/drEnablement.json)

### Resource types "replicationProtectionContainerMappings" have dependencies on themselves

{
"type": "Microsoft.RecoveryServices/vaults/replicationFabrics/replicationProtectionContainers/replicationProtectionContainerMappings",
"name": "[**variables('sourceMapping')**]",
"apiVersion": "2016-08-10",
"properties": {
"policyId": "[resourceId('Microsoft.RecoveryServices/vaults/replicationPolicies/', variables('vaultName'), '24-hour-retention-policy')]",
"targetProtectionContainerId": "[concat('/subscriptions/', subscription().id, '/resourceGroups/', resourceGroup().name, '/providers/Microsoft.RecoveryServices/vaults/', variables('targetMapping'))]"
},
"dependsOn": [
"[**variables('sourceMapping')**]",
"[variables('targetMapping')]",
"[resourceId('Microsoft.RecoveryServices/vaults/', variables('vaultName'), '24-hour-retention-policy')]"
]
},
{
"type": "Microsoft.RecoveryServices/vaults/replicationFabrics/replicationProtectionContainers/replicationProtectionContainerMappings",
"name": "[**variables('targetMapping')**]",
"apiVersion": "2016-08-10",
"properties": {
"policyId": "[resourceId('Microsoft.RecoveryServices/vaults/replicationPolicies/', variables('vaultName'), '24-hour-retention-policy')]",
"targetProtectionContainerId": "[concat('/subscriptions/', subscription().id, '/resourceGroups/', resourceGroup().name, '/providers/Microsoft.RecoveryServices/vaults/', variables('sourceMapping'))]"
},
"dependsOn": [
"[variables('sourceMapping')]",
"[**variables('targetMapping')**]",
"[resourceId('Microsoft.RecoveryServices/vaults/', variables('vaultName'), '24-hour-retention-policy')]"
]
},

Open azmgmt-demo/nestedtemplates/drEnablement.json and inspect the dependsOn arrays for the two replicationProtectionContainerMappings resources. Remove the self-dependencies identified in the issue, then validate that each mapping still depends on the required source or target resources and policy without depending on itself.

Written by the indexing model from the issue text.