[idmap] Add logging for the service start/stop

As of now it's impossible to tell what happened or is happening
to idmap2d - and that's the important thing in the bug. Adding
some logging to help investigating it if it happens again

Bug: 219393586
Test: manual
Change-Id: Ia6615f80d8a4b7ba94714f0af10e09ba9d709bb6
1 file changed