When creating a virtual machine via Foreman on a VMware compute resource (ESX), the boot order of the VM has the hard disk as first boot device and network as last boot device.
This works for the first VM build because there's nothing on the VM HDD, but when you try to rebuild the VM the PXE image is never loaded from the network because the installed OS is booted first from HDD.
Somehow the default boot order should have network set as the first boot device, just like it happens for other compute resource types, e.g. libvirt/KVM.

This would also partly satisfy this feature request: http://projects.theforeman.org/issues/4317