Support migration patch resource used to manage a nested resource

The nested resource has its own resource id, it's different from the azurem resource's id pattern.

For example, SOA record's id looks like
`/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/dnsZones/{zoneName}/{recordType}/{relativeRecordSetName}`

But its target resource `azurerm_dns_zone`'s id pattern looks like
`/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/dnsZones/{zoneName}`

So we need to manually maintain this mapping in https://github.com/ms-henglu/azurerm-restapi-to-azurerm/blob/master/azurerm/loader/loader_hardcode.go