Since "aa8a842 kernel plugin: use latest stable core snap (#1624)" the kernel plugin forcefully download core from the stable channel (while previously that was the edge channel). Introduce the ability to let the user choose which channel to use via the 'kernel_channel' keyword: + - kernel-channel: + (string) + from which channel core is downloaded (stable, beta, candidate or edge) + If not specified, the kernel plugin will default to use 'stable', so no semantic changes are introduced.