nitb: Add a test for "show network" in the python testsuite.

Make sure that bsc_gsmnet->bsc_data->rf_ctrl is initialized for
NITB. In commit a9fae1ae66df57f76a0aedbd0b56228959d37d56 the
conditions for the rf_ctrl was removed but it was still needed
for the NITB.

Fixes regression from:
a9fae1ae66df57f76a0aedbd0b56228959d37d56
bsc: rf_ctrl will always be created, remove the NULL checks
diff --git a/openbsc/tests/vty_test_runner.py b/openbsc/tests/vty_test_runner.py
index 7c8fe8c..6bbc606 100644
--- a/openbsc/tests/vty_test_runner.py
+++ b/openbsc/tests/vty_test_runner.py
@@ -248,6 +248,10 @@
         res = self.vty.command("show paging-group 0 1234567")
         self.assertEquals(res, "%Paging group for IMSI 1234567 on BTS #0 is 7")
 
+    def testShowNetwork(self):
+        res = self.vty.command("show network")
+        self.assert_(res.startswith('BSC is on Country Code') >= 0)
+
 class TestVTYBSC(TestVTYGenericBSC):
 
     def vty_command(self):
@@ -382,6 +386,10 @@
         res = self.vty.command("write terminal")
         self.assertEquals(res.find(' timezone'), -1)
 
+    def testShowNetwork(self):
+        res = self.vty.command("show network")
+        self.assert_(res.startswith('BSC is on Country Code') >= 0)
+
 class TestVTYNAT(TestVTYGenericBSC):
 
     def vty_command(self):