test: Clone libvirt.git via https:// instead of git://
test: Clone libvirt.git via https:// instead of git://

The git:// protocol can cause issues when the client is
behind a corporate firewall; https:// works in pretty much
any scenario, and these days it's basically as efficient.

Signed-off-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Reviewed-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-go-xml