on_error hook support

[tnorris]

Hi,

I think it would be useful if sof had error hook support, that way a plugin could have a remediation step built in. User hits "y" to run, and hopefully the stuff is resolved.

[pdrakeweb]

Interesting idea. I think the tough part would be knowing in what order to attempt remediations when more than one failure occurs on a given server. We could prompt with a set of possible remediations for selection rather than a simple y/n.