bsc/osmo-bsc.cfg: change logging level nm info -> notice

Stop spamming logs with tons of DNM messages (state changes, events).
GSMTAP emits all these messages (including 'debug' ones) anyway.

Related: I49352b3caf9f6bbdd594cfcdea54038fc0eaa874 (docker-playground.git)
Change-Id: I9e60ea0968a44aa29753226626864ac9f4c1f8ab
diff --git a/bsc/osmo-bsc.cfg b/bsc/osmo-bsc.cfg
index 63a82b0..2f8ee6d 100644
--- a/bsc/osmo-bsc.cfg
+++ b/bsc/osmo-bsc.cfg
@@ -18,7 +18,7 @@
  logging level mm notice
  logging level rr notice
  logging level rsl notice
- logging level nm info
+ logging level nm notice
  logging level pag notice
  logging level meas notice
  logging level msc notice