CloudStack builder can't find service/disk offerings of ROOT domain in a CloudStack domain setting

还没有人认领这个 Issue。

_This issue was originally opened by @hrak in https://github.com/hashicorp/packer/issues/4541 and has been migrated to this repository. The original issue description is below._

---
When using domains in CloudStack, any disk or service offering created in the ROOT domain is not available for use in Packer in any other domain than ROOT, because the API call for discovering disk & service offerings does not pass the 'listall=true' flag.

As a workaround i have now duplicated a service offering from the ROOT domain in my team domain, but it would be nice if packer sees the default offerings of the ROOT domain.

Packer output:
```
cloudstack output will be in this color.

==> cloudstack: Preparing config...
==> cloudstack: 1 error(s) occurred:
==> cloudstack:
==> cloudstack: * Error retrieving UUID of disk offering : No match found for Medium: &{Count:0 DiskOfferings:[]}
Build 'cloudstack' finished.

==> Builds finished. The artifacts of successful builds are:
```

```
☁ Apache CloudStack 🐵 cloudmonkey 5.3.2. Type help or ? to list commands.

Using management server profile: local

(local) 🐵 > list diskofferings
(local) 🐵 >
(local) 🐵 > list diskofferings listall=true
{
"count": 3,
"diskoffering": [
{
"created": "2015-12-04T15:19:59+0000",
"disksize": 5,
"displayoffering": true,
"displaytext": "Small Disk, 5 GB",
"id": "7ed5b6fe-abcf-4769-a9ea-180aa7240279",
"iscustomized": false,
"name": "Small",
"provisioningtype": "thin",
"storagetype": "shared"
},
{
"created": "2015-12-04T15:19:59+0000",
"disksize": 20,
"displayoffering": true,
"displaytext": "Medium Disk, 20 GB",
"id": "62f4cdf6-5d01-410c-9ca4-0addc9097229",
"iscustomized": false,
"name": "Medium",
"provisioningtype": "thin",
"storagetype": "shared"
},
{
"created": "2015-12-04T15:19:59+0000",
"disksize": 100,
"displayoffering": true,
"displaytext": "Large Disk, 100 GB",
"id": "4517e129-034c-4659-8b56-d8e19b5fb540",
"iscustomized": false,
"name": "Large",
"provisioningtype": "thin",
"storagetype": "shared"
}
]
}
```

Packer version: 0.12.2
CloudStack version: 4.8

从用于发现磁盘和服务 offering 的 CloudStack builder 代码开始，然后跟踪用于这些查询的 API 调用。复现默认请求与带有 `listall=true` 的请求之间的差异；当可以在另一个域中发现 ROOT 域的 offering，并且在附近存在测试时同时覆盖磁盘和服务 offering，即表示完成。

由索引模型根据 Issue 内容生成。