Fixed feed as agreed over phone.

On status call we agreed on:
* enough to scan nexus.log and nexus.log.1 in this order
* still, user is able to override which log to scan using "lts" query param
* feed "scanning" is still less than ideal, but reworked to properly
  extract entries
* ITs update, no more "lts" param, feed works as expected
* removed the explicit neg-checks for TimelineEx and Jetty EofEx,
  as both of these ex spams were fixed in 2.2+