Instead of having to manually stub packages that should not be
downloaded we instead automatically stub all packages (except a small
list of whitelisted ones). Tests can re-introduce the real package by
using the `realPkgs` module argument.
We currently have no way of specifying the sender's name inside the
From field, making a patch sent through `git send-email` appear as
coming from "xxx@domain.com".
In this commit we make this field follow the standard
realName <email>
format.
The git-send-email [0] script uses StartTLS if `smtpEncryption` is set
to `tls`, which can break services that don't support StartTLS.
[0]: bd42bbe1a4/git-send-email.perl (L1533)
PR #1395
