fix VTY parsing: subscriber-create-on-demand random

Fix parsing of the 'subscriber-create-on-demand random' VTY: atoi() is not
enough to include the specified range of 1-9999999999.

Use atoll() instead to ensure a large enough number space also on 32bit
systems.

(Note: for me, atoll() truncates at 32 bit when <stdlib.h> is not included.)

Add a VTY regression test for this.

Related: OS#2253
Change-Id: I353e04481ec567adca383d6b51ba8fb865eed73e
diff --git a/openbsc/tests/vty_test_runner.py b/openbsc/tests/vty_test_runner.py
index 305c956..b886911 100644
--- a/openbsc/tests/vty_test_runner.py
+++ b/openbsc/tests/vty_test_runner.py
@@ -476,6 +476,17 @@
         res = self.vty.command('show subscriber imsi '+imsi)
         self.assert_(('% No subscriber found for imsi ' + imsi) == res)
 
+        # range
+        self.vty.command("end")
+        self.vty.command("configure terminal")
+        self.vty.command("nitb")
+        self.assertTrue(self.vty.verify("subscriber-create-on-demand random 9999999998 9999999999", ['']))
+        res = self.vty.command("show running-config")
+        self.assert_(res.find("subscriber-create-on-demand random 9999999998 9999999999"))
+        self.vty.command("end")
+
+
+
     def testSubscriberSettings(self):
         self.vty.enable()