New SOPs--please review and correct

[John Poelstra]

Jesse wrote all the steps down and I wiki-fied them.

Please review the pages below and *make changes to the wiki* as necessary.

https://fedoraproject.org/wiki/Create_release_signing_key
https://fedoraproject.org/wiki/Composing_test_images

I suggest making these SOPs as detailed as possible, even if the needed 
commands are obvious to most people.  We are creating these for people 
new to Release Engineering (like me) who can become potential 
contributors so we should make it as easy as possible for them.

Please understand that that I have never performed any of these tasks 
myself or access to the systems to do.  Therefore I have no way to know 
if what I've formalized makes complete sense or works. If system access 
is available to do so I'd be glad to proof these SOPs in that way.

I'd love to get feedback and updates by Monday's Release Engineering 
meeting so that we can mark these done and tackle another one next week! :)

Thanks,
John