osmo-bsc/bsc_vty: set default gprs cell bvci to 2

Do not use 0 as default, as it is reserved for signalling.

Related: OS#4408
Change-Id: I499272f16aadd89f3bdb5d749e3e4f9e07056c15
diff --git a/tests/gprs_bvci_default.vty b/tests/gprs_bvci_default.vty
new file mode 100644
index 0000000..4bd95ce
--- /dev/null
+++ b/tests/gprs_bvci_default.vty
@@ -0,0 +1,13 @@
+OsmoBSC> enable
+OsmoBSC# configure terminal
+OsmoBSC(config)# network
+OsmoBSC(config-net)# bts 0
+OsmoBSC(config-net-bts)# gprs mode gprs
+OsmoBSC(config-net-bts)# exit
+
+OsmoBSC(config-net)# show running-config
+...
+ bts 0
+...
+  gprs cell bvci 2
+...