Add reference of the dependent update sites for reddeer p2 update sit…

[odockal]

…e, fixes #2142

Signed-off-by: Ondrej Dockal odockal@redhat.com

Pull Request Checklist

Code

• Are method-/class-/variable-names meaningful?
• Are methods concise, not too long?
• Are catch blocks catching precise Exceptions only (no catch all)?
• Is copyright with correct year in new files?
• Is there a JavaDoc in every class with description of a class and an author(and issue if suitable)?
• Is there a link to github project issue? (if needed)

Testing

• Does it work?
• Are the tests green on Jenkins? Is there a link to Jenkins build?