Version our EL profiling

This is just a clever way of marking messages as being useful again -
this way I don't need to go through the hassle of deleting old data.

Change-Id: I6a0574eaae063014340484ffd2552f8118abb939
(cherry picked from commit da86c5f7505c6d8365639f34f97f773f59b99480)
Merge "Version our EL profiling" into wmf/1.23wmf9