Add hnbgw tests

Some tests for osmo-hnbgw with mgw support:
* hnb register
* ranap connect/disconnect
* rab assignment/release

Change-Id: I0a2fb795aec83337eda8d9972e6ff264ead61076
diff --git a/hnbgw/osmo-stp.cfg b/hnbgw/osmo-stp.cfg
new file mode 100644
index 0000000..85d60e9
--- /dev/null
+++ b/hnbgw/osmo-stp.cfg
@@ -0,0 +1,52 @@
+!
+! OsmoSTP (0.8.1) configuration saved from vty
+!!
+!
+log stderr
+ logging filter all 1
+ logging color 1
+ logging print category 1
+ logging timestamp 1
+ logging print extended-timestamp 1
+ logging level lglobal notice
+ logging level llapd notice
+ logging level linp notice
+ logging level lmux notice
+ logging level lmi notice
+ logging level lmib notice
+ logging level lsms notice
+ logging level lctrl notice
+ logging level lgtp notice
+ logging level lstats notice
+ logging level lgsup notice
+ logging level loap notice
+ logging level lss7 debug
+ logging level lsccp debug
+ logging level lsua debug
+ logging level lm3ua debug
+ logging level lmgcp notice
+!
+line vty
+ no login
+!
+cs7 instance 0
+ xua rkm routing-key-allocation dynamic-permitted
+ asp virt-msc0-0 23905 2905 m3ua
+  local-ip 127.0.0.1
+  remote-ip 127.0.0.1
+ as virt-msc0 m3ua
+  asp virt-msc0-0
+  routing-key 1 0.23.4
+ asp virt-sgsn0-0 23906 2905 m3ua
+  local-ip 127.0.0.1
+  remote-ip 127.0.0.1
+ as virt-sgsn0 m3ua
+  asp virt-sgsn0-0
+  routing-key 2 0.23.1
+
+
+ route-table system
+  update route 0.23.4 7.255.7 linkset virt-msc0
+  update route 0.23.1 7.255.7 linkset virt-sgsn0
+ listen m3ua 2905
+  accept-asp-connections dynamic-permitted