[ Enhancement ] On Stream, view creations should be postponed to the end

[davidducos]

Reviewing #657, I realized that we are creating the views as soon as they arrive, but we should be creating at the end. Not sure if this is something that we should fix in mydumper or myloader. More analysis needs to be done to determine it.

Originally posted by @hubiongithub in #657 (comment)

[davidducos]

We made several changes and now, directory backups are working as stream backups, so, we show be retrying view creations if they are failing. As I also found that if a view is using a SP and the SP is not created before the view, it will failed. We should be adding a sync stage between sp and view.