Update OVA to use photon 2.0

[kars7e]

• move ova infra to top-level directory from scripts subdirectory
• Use dispatch image for building OVA based on photon 2.0
• Update scripts to work properly on photon 2.0
• Fix ovfenv binary to work properly in fusion
• Fix minor bugs causing errors in OVA logs

photon 2.0-based OVA is ~30% smaller than the previous one

Tested on Fusion 11.0 and VMC

[kars7e]

Thanks Zach!