Feature roadmap/Image signing key delegation

Feature subcategory		Is part of::Category:Security, activation and deployability
Requesters		{{#arraymap:Uruguay|,|x|Requested by::x}}
Requirements		* Must all a deployment to generate an image with their own key. See Trac ID: 9045 After a key has been generated for a country, must not require them to contact OLPC for any further information to make the signed image. Can allow deployments to sign with their own key or with a key delegated from us.
Specification		See Partial key autonomy for one idea on how to implement this today.
Owners		{{#arraymap:CScott|,|x|Contact person::User:x}}
Priority		Priority::1
Helps deployability?		Helps deployability::yes
Target for 9.1?		Target for 9.1::yes