Support for downloading Vault through proxy.

[ekranium]

Hello, I am having a abit of a problem downloading Vault, through is module on a system that requires proxy (whitelist enterprise proxy.) Is there any room for supporting this? All you need is hiera names for proxy and:

curl --proxy http://address:port https://releases.hashicorp.com/vault/1.4.2/vault_1.4.2_linux_amd64.zip -o /tmp/vault.zip-"numbers" -fsSLg --max-redirs 5

The workaround is just downloading the zip file and putting it into the /tmp folder.