Add support for vagrantcloud

[davidkarlsen]

Having vagrantcloud boxes, vagrant does not use the configured proxy, and instead attempts direct connection to vagrant cloud.

Netstat:
ec2-107-23-113-67.com:https SYN_SENT

Vagrant:
Error: Failed connect to vagrantcloud.com:443; Connection timed out

Expected:
Requests should use the configured proxy by proxyconf plugin.

[tmatilai]

Hi David,

Thanks for the issue! Anyway this is duplicate for #53. Please read more information there, but the problem with this is that depending on the vagrant command, it's possible that the (project's) Vagrantfile or even the plugin is not loaded. And another issue is that if people use Vagrant and the proxyconf plugin mainly with cloud providers like vagrant-aws, the proxy configuration might be totally different than on the workstation.

But before we get to implement #53 in some form, you can yourself set HTTPS_PROXY (and HTTP_PROXY) environment variables. Vagrant will use them when downloading boxes, plugins, etc.

[davidkarlsen]

Thanks for coming back to me. Your points are indeed valid.
However there is a bug in vagrant, so I created: hashicorp/vagrant#4051