edit-node: Set system release according to the name

system-release will now use the same name which is passed with --name.

Change-Id: Id40f4ccafa872a259b9b7e29574682df1d76b9c2
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1087118
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>