ifmap-server: Fix logrotate configuration (use copytruncate)

Truncate the original log file to zero size in place after creating a
copy, instead of moving the old log file and optionally creating a new
one.

Change-Id: Ia8a3bb6ffb9a937c734672c4c994ab6ffbe64256
(cherry picked from commit b0b19ad111d2e6c353ea7d1f2a7bf5f348fddb51)
Merge "ifmap-server: Fix logrotate configuration (use copytruncate)" into R1.10