add an action to change the interface type of a vm (vmxnet3, ...)

[timogoebel]

A check should exist to make sure all VMs use vmxnet3. It should be possible to change the interface type of a VM from e1000 to vmxnet3 via a remediate action. The action needs to shut down the VM, change the network interface type (possibly by removing the network card and adding a new one with the old mac address) and start the VM again.