Fix vty tests with subscriber deletion

Use correct vty command for subscriber deletion, adjust assertions
accordingly. The error was cause by inconsistent syntax of vty commands
for subscriber creation and deletion.

Change-Id: I9b9376b4ac0ec066000545167de312ca4460493b
diff --git a/openbsc/tests/vty_test_runner.py b/openbsc/tests/vty_test_runner.py
index 9ea988d..bae1866 100644
--- a/openbsc/tests/vty_test_runner.py
+++ b/openbsc/tests/vty_test_runner.py
@@ -388,12 +388,12 @@
         self.assert_(res.find("    IMSI: "+imsi) > 0)
 
         # Delete it
-        res = self.vty.command('subscriber delete imsi '+imsi)
-        self.assert_(res != "")
+        res = self.vty.command('subscriber imsi ' + imsi + ' delete')
+        self.assert_("" == res)
 
         # Now it should not be there anymore
         res = self.vty.command('show subscriber imsi '+imsi)
-        self.assert_(res != '% No subscriber found for imsi '+imsi)
+        self.assert_(('% No subscriber found for imsi ' + imsi) == res)
 
 
     def testSubscriberCreateDelete(self):
@@ -413,12 +413,12 @@
         self.assert_(res.find("    IMSI: "+imsi) > 0)
 
         # Delete it
-        res = self.vty.command('subscriber delete imsi '+imsi)
-        self.assert_(res != "")
+        res = self.vty.command('subscriber imsi ' + imsi + ' delete')
+        self.assert_("" == res)
 
         # Now it should not be there anymore
         res = self.vty.command('show subscriber imsi '+imsi)
-        self.assert_(res != '% No subscriber found for imsi '+imsi)
+        self.assert_(('% No subscriber found for imsi ' + imsi) == res)
 
     def testSubscriberSettings(self):
         self.vty.enable()
@@ -456,16 +456,18 @@
         self.assertTrue(self.vty.verify("subscriber-create-on-demand random 221 222", ['']))
         self.vty.command("end")
 
+        # create subscriber with extension in a configured interval
         res = self.vty.command('subscriber create imsi ' + imsi2)
         self.assert_(res.find("    IMSI: " + imsi2) > 0)
         self.assert_(res.find("221") > 0 or res.find("222") > 0)
         self.assert_(res.find("    Extension: ") > 0)
 
         # Delete it
-        res = self.vty.command('subscriber delete imsi '+imsi)
+        res = self.vty.command('subscriber imsi ' + imsi + ' delete')
         self.assert_(res != "")
-        res = self.vty.command('subscriber delete imsi ' + imsi2)
-        self.assert_(res != "")
+        # imsi2 is inactive so deletion should succeed
+        res = self.vty.command('subscriber imsi ' + imsi2 + ' delete')
+        self.assert_("" == res)
 
     def testShowPagingGroup(self):
         res = self.vty.command("show paging-group 255 1234567")