aoip: add osmo-stp, now required for aoip runs

Change-Id: I35d4cb0d173eec240bccc1f3a5965a774b7b3506
diff --git a/suites/aoip_sms/suite.conf b/suites/aoip_sms/suite.conf
index c6cbd88..216d3ea 100644
--- a/suites/aoip_sms/suite.conf
+++ b/suites/aoip_sms/suite.conf
@@ -1,6 +1,6 @@
 resources:
   ip_address:
-  - times: 4
+  - times: 5 # msc, bsc, hlr, stp, mgw
   bts:
   - times: 1
   modem: