change way of storing VM notes

OndrejHome commented 6 years ago

use the virsh desc domain as the only storage for the VM notes and other metadata instead of file used now.

[x] implement use of metadata functions instead of current use of files
[x] drop the need for 'sg' in code and requirements
[x] create script for transforming data from files into new metadata format
[x] update configure-fast-vm to not ask about note storage and allow it to rather ask for conversion

Identified cons of this change:

reading data from libvirt will always be slower than from files (50-70% time increase in reading metadata) - this is heavily used in fast-vm list where the slowdown is visible (on my testing machine from 0.7s to 1.1s with 10 VMs)

OndrejHome commented 6 years ago

Functions for this introduced in commit a9a14a47785feb4d9a9c791e28b514a6e5d65e8e

OndrejHome commented 6 years ago

released in 1.4

OndrejHome / fast-vm