Add support for native vSphere HTTP boot

[jrsmile]

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Description

It would safe a lot of time and be a lot more robust to utilize the native http boot function of vsphere to boot an iso.
more here click

Use Case(s)

as packer already serves the preseed via http it could do the same with the iso and just create an empty vm with the right http boot url configuration. a upload to a datastore is no longer necessary. furthermore http boot supports adding cmdline parameters for the kernel if booted via kernel image. (an extraction of the iso/mount would be necessary on the box that runs packer.)