osmo-mgw.cfg: add missing statsd configuration

The recently added test TC_dlcx_wildcarded depends on statsd information
from osmo-mgw but in the osmo-mgw configuration no statsd is configured.

Change-Id: I35e07a6b1853234559ab4d7e044f3899e8d0a3e8
Related: SYS#5535
diff --git a/mgw/osmo-mgw.cfg b/mgw/osmo-mgw.cfg
index 76525bc..8428cd3 100644
--- a/mgw/osmo-mgw.cfg
+++ b/mgw/osmo-mgw.cfg
@@ -17,6 +17,16 @@
  no login
  bind 127.0.0.1
 !
+stats interval 0
+stats reporter statsd
+ prefix TTCN3
+ level global
+ remote-ip 127.0.0.1
+ remote-port 8125
+ flush-period 1
+ mtu 1024
+ enable
+!
 mgcp
   bind ip 127.0.0.1
   bind port 2427