Add support for Packer 1.1: set expect_disconnect to true.
Add support for Packer 1.1: set expect_disconnect to true.

Otherwise update.sh will fail because the reboot disconnects and then packer bails out (see https://github.com/hashicorp/packer/blob/master/CHANGELOG.md#backwards-incompatibilities).

boxcutter/fedora,boxcutter/fedora,bertvv/fedora,bertvv/fedora