B OpenNebula#68: Update pip

M #-: Bump to 6.0

M #-: Rework IPs for --frontend only (Edge prep)

M #-: Deprecate Edge, LXD and Firecracker opts

Support FE + KVM, or pure FE installation

Docs for Edge + Firecracker, private IPs

5.12 docs

Install libssl-dev, minor fixes

jq+curl required doc --edge, print hint

Allow to use also project-based API Packet keys

Validate available plans in given facility