Prospero: "revert prepare" command adds manifest version to channel to both original EAP and candidate EAP. Manifest version should not be hardcoded in channel, update can't be performed otherwise.

I consider this jira as a blocker, because this is a regression against EAP 8.0, but I don't think that this is beta blocker. So it just blocks EAP 8.1.0.GA.