gitmodules: use 'https://' instead of 'git://'

gitmodules: use 'https://' instead of 'git://'

When you clone the repository without previous commit history, 'git://'
doesn't protect from man-in-the-middle attacks.  HTTPS is more secure
since the client verifies the server certificate.

Also change git.qemu-project.org to git.qemu.org (we control both domain
names but qemu.org is used more widely).

Reported-by: Jann Horn <jannh@google.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20181108111531.30671-5-stefanha@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>