setup-phase3: fix a couple re-run issues

Signed-off-by: Christopher Larson <kergoth@gmail.com>
setup-phase3: enable the dropbear service, not socket

Using a socket activation with ssh can cause timing problems with the
authentication. We used to hit this trying to use inetd as well, so switch
back to an always running service -- dropbear doesn't have much of a resource
impact anyway.

Signed-off-by: Christopher Larson <kergoth@gmail.com>
setup-phase3: update vmware handling

- use open-vm-tools-dkms, not the nonexistant open-vm-tools-modules
- use systemd .mount/.automount for /mnt/hgfs

Signed-off-by: Christopher Larson <kergoth@gmail.com>