sgsn: osmo-*.cfg: tune logging configuration

Change-Id: I2f2cc69a481709e862d569b0298561b61506dfa7
diff --git a/sgsn/osmo-stp.cfg b/sgsn/osmo-stp.cfg
index 7823f2a..23c4e8f 100644
--- a/sgsn/osmo-stp.cfg
+++ b/sgsn/osmo-stp.cfg
@@ -7,12 +7,13 @@
  logging filter all 1
 !
 log stderr
- logging color 1
  logging filter all 1
- logging print level 1
- logging print category 1
- logging timestamp 1
  logging print extended-timestamp 1
+ logging print file basename last
+ logging print category-hex 0
+ logging print category 1
+ logging print level 1
+ logging color 1
  logging level lglobal notice
  logging level llapd notice
  logging level linp notice