[ifmap-server] Reduce loglevel of ifmap-server (default to debug…)

(cherry-picked from commit db218cfc6da7ef7431bb2aab8a719b724abba0b0)
Merge pull request #127 from sbadia/R1.06

Backport to R1.06 -- [ifmap-server] Reduce loglevel of ifmap-server (default to debug…)