Update to armbian stable v20.11 Bump to stable armbian v20.11

Runtime migrated to python3

**Note:**New HSL streaming of octoPi is not incluided as octoPi 0.18 is still no stable

New boards:

• Added orange PI PC+

• Added BananaPI M2

• Added Rock64

Builder:

• Vagrant build uses now ubuntu focal 64 box.
• Updated base packages including libatlas3-base for numpy wheel usage
• Added piwheels source to pip to speed up builds

Upstream versions:

• Armbian: 20.11.4
• OctoPi: 0.17.0
• Octoprint: 1.5.2