Change VMware output from personal to enterprise

This output format is intended for ESX[i] instead of Fusion, which matches
our vCloud destination more closely.

In practice this has very little effect on the resulting OVF. It changes the
default name of the network from `NAT` to `VM Network`. It is meant to allow
customisation of the network name using `hardware.network`, but Boxgrinder's
schema validation doesn't actually allow for this.
[#50823307] Change network name to Default

This isn't currently possible with Boxgrinder due to differences in the
plugin and appliance schema validation. We have to workaround it by munging
the XML in the resulting OVF :(

Tested on SS Platform1. Produces a template that vcloud-box-spinner can
provision and customise with a static IP.