The https:// protocol is much more reliably usable than git:// when
faced with unreasonably strict firewalls. The libvirt.org web server is
now setup to support the smart https:// protocol, which is just as fast
as git://, so change all the docs to use https://
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>