Fixes #9198 - migration sets type explicitly

[ares]

This fixes existing migration. There's no way to safely fix from new migration (see below) so we should merge this ASAP. For users with already broken DB, this snippet executed from foreman console will help

Nic::Base.where(:type => nil).all.each {|n| n.type = 'Nic::Managed'; n.save!}

I would rather avoid adding new migration changing all Nics with unspecified type to Nic::Managed because we have no idea where they come from. Comments to this welcome.

[ohadlevy]

:+1 would you consider adding rake tasks to fix it? or at least some way to detect it actively (vs. let the users search for the missing/corrupted interfaces ?

[ohadlevy]

merged as b328d4c thanks @ares