Use Powershell 6 GA and PowerCLI 10 GA

[kars7e]

• Use official powershell 6.x GA image based on Ubuntu 16.04
• Install PowerCLI and PowerNSX from PSGallery

[jakerobinson]

You're changing from Photon to Ubuntu here. I don't mind having a different ubuntu branch, but we're going to keep this photon. stay tuned :)

[kars7e]

Indeed, I actually ended up using photon as well, as it's smaller. Here is my version (it doesn't have the powercli installed, but just one more Save-Module line) https://github.com/kars7e/dispatch/blob/8a8f494f715c6ef38fb0b16f677b0720d67f5c1f/images/base-images/powershell/Dockerfile

[jakerobinson]

@kars7e Can you submit a new PR to an ubuntu16_04 branch? Your commit is great, and I'd love to put it up, just not on the master branch, which is photon

[kars7e]

Will do!