INFO level is suppose to be used for informational messages that are
useful for ordinary user, but in several places we used it as a DEBUG
output.
In CS the level is reduced even more, to TRACE.
Change-Id: I9058e25d95de79661099dd4624d802cc33420983
Fib::removeNextHopFromAllEntries automatically deletes fib::Entry
if the last nexthop record is being removed.
refs #1341
Change-Id: I36d42fe8f9fc8f03d194f845020aff408cd70488