auto-t: speed up testRoamRetry

This test took quite a while to execute (~2 minutes on my machine)
because there was simply no other way to test this scenario but
waiting. Now the no-roam-candidates condition can be waited for
rather than just sleeping for 20 seconds. Additionally the default
RoamRetryInterval was being used which is 60 seconds. Instead
main.conf can set this to 5 seconds and really cut down on the time
to wait.

Part of a comment was also removed due to being incorrect. Even
with neighbor reports IWD still must scan, its just that the
scan is more limited and, in theory, faster.

autotests/testRoamRetry/fast_retry_test.py

@@ -82,7 +82,7 @@ class Test(unittest.TestCase):
         # schedule another attempt for 60 seconds later
         rule0.signal = -8000
 
-        wd.wait(20)
+        device.wait_for_event('no-roam-candidates')
 
         self.assertEqual(device.state, iwd.DeviceState.connected)
         self.assertTrue(bss_hostapd[0].list_sta())
@@ -99,13 +99,12 @@ class Test(unittest.TestCase):
         wd.wait(1)
 
         # Assert low signal for BSS 0, check that iwd starts transition to BSS 1
-        # in less than 10 seconds. Because of the neighbor report a scan should
-        # not be necessary.
+        # in less than 10 seconds.
         rule0.signal = -8000
         rule1.signal = -2000
 
         condition = 'obj.state == DeviceState.roaming'
-        wd.wait_for_object_condition(device, condition, max_wait=10)
+        wd.wait_for_object_condition(device, condition, max_wait=15)
 
         # Check that iwd is on BSS 1 once out of roaming state and doesn't
         # go through 'disconnected', 'autoconnect', 'connecting' in between

autotests/testRoamRetry/main.conf

@@ -0,0 +1,2 @@
+[General]
+RoamRetryInterval=5

autotests/testRoamRetry/stop_retry_test.py

@@ -99,7 +99,7 @@ class Test(unittest.TestCase):
 
         condition = 'obj.state == DeviceState.roaming'
         self.assertRaises(TimeoutError, wd.wait_for_object_condition, device,
-                          condition, max_wait=70)
+                          condition, max_wait=10)
 
         device.disconnect()