bsc: fix osmo-stp.cfg: missing smlc routing

Without the SMLC routing in place, virtually all BSC_Tests fail with:

VirtSMLC-BSSAP_LE(8)@x42: setverdict(fail): none -> fail reason: "BSSMAP-LE: Timeout waiting for RESET-ACK after sending RESET"

Copy the SMLC part of osmo-stp.cfg from
docker-playground/ttcn3-bsc-test/osmo-stp.cfg and localhost-ize it.

Change-Id: I274515e7e9205c895cd250abed7361aef5a33f56
diff --git a/bsc/osmo-stp.cfg b/bsc/osmo-stp.cfg
index b29dc91..7ea46a4 100644
--- a/bsc/osmo-stp.cfg
+++ b/bsc/osmo-stp.cfg
@@ -55,10 +55,18 @@
   asp virt-msc2-0
   routing-key 3 0.0.3
 
+ asp virt-smlc-0 23908 2905 m3ua
+  local-ip 127.0.0.1
+  remote-ip 127.0.0.1
+ as virt-smlc m3ua
+  asp virt-smlc-0
+  routing-key 6 0.23.6
+
  route-table system
   update route 0.23.1 7.255.7 linkset virt-msc0
   update route 0.0.2 7.255.7 linkset virt-msc1
   update route 0.0.3 7.255.7 linkset virt-msc2
+  update route 0.23.6 7.255.7 linkset virt-smlc
  listen m3ua 2905
   accept-asp-connections dynamic-permitted
  listen ipa 5000