Remove unavailable cloud vendors: auroracompute; InternetSolutions; dimension data

## Summary

Adding support for all your cloud vendors and came across broken domains for:
- https://libcloud.readthedocs.io/en/stable/compute/drivers/auroracompute.html (which has a domain that is for sale)
- https://libcloud.readthedocs.io/en/stable/compute/drivers/internetsolutions.html (http://www.is.co.za site is down)
- https://libcloud.readthedocs.io/en/stable/compute/drivers/dimensiondata.html (redirects to ntt now which has two other vendors on libcloud already… I assume this company was bought by NTT)

Might be worth removing these vendors. (might update this issue with PRs and any other vendors that have disappeared)

先查看 auroracompute、internetsolutions 和 dimensiondata 的三个相关驱动程序文档页面，然后找到它们对应的实现和存储库引用。确认这些供应商已不可用，并检查任何相关测试或文档；当过时的支持和引用都被一致地移除后，工作即告完成。

由索引模型根据 Issue 内容生成。