auto-t: add test for fixed scanning crash

This simulates the conditions that trigger a free-after-use which was
fixed with:

2c355db7 ("scan: remove periodic scans from queue on abort")

This behavior can be reproduced reliably using this test with the above
patch reverted.

autotests/testScan/remove_iface_test.py

@@ -0,0 +1,32 @@
+#!/usr/bin/python3
+
+import unittest
+import sys
+import os
+
+sys.path.append('../util')
+from iwd import IWD
+from config import ctx
+
+class Test(unittest.TestCase):
+    def test_connection_success(self):
+        wd = IWD(True)
+
+        devices = wd.list_devices(1)
+        device = devices[0]
+
+        device.autoconnect = True
+        device.scan(wait=False)
+
+        os.system('ifconfig %s down' % device.name)
+
+    @classmethod
+    def setUpClass(cls):
+        pass
+
+    @classmethod
+    def tearDownClass(cls):
+        IWD.clear_storage()
+
+if __name__ == '__main__':
+    unittest.main(exit=True)