test_lightningd: Increase times in expiration waiting test.

Fixes: #916

Makes it less flaky, as, the increased times reduce the
relative delay in processing by slower machines.

tests/test_lightningd.py

@@ -404,25 +404,25 @@ class LightningDTests(BaseLightningDTests):
 
         # Test expiration waiting.
         # The second invoice created expires first.
-        l2.rpc.invoice('any', 'inv1', 'description', 5)
+        l2.rpc.invoice('any', 'inv1', 'description', 10)
-        l2.rpc.invoice('any', 'inv2', 'description', 2)
+        l2.rpc.invoice('any', 'inv2', 'description', 4)
-        l2.rpc.invoice('any', 'inv3', 'description', 8)
+        l2.rpc.invoice('any', 'inv3', 'description', 16)
         # Check waitinvoice correctly waits
         w1 = self.executor.submit(l2.rpc.waitinvoice, 'inv1')
         w2 = self.executor.submit(l2.rpc.waitinvoice, 'inv2')
         w3 = self.executor.submit(l2.rpc.waitinvoice, 'inv3')
-        time.sleep(1) # total 1
+        time.sleep(2) # total 2
         assert not w1.done()
         assert not w2.done()
         assert not w3.done()
-        time.sleep(2) # total 3
+        time.sleep(4) # total 6
         assert not w1.done()
         self.assertRaises(ValueError, w2.result)
         assert not w3.done()
-        time.sleep(3) # total 6
+        time.sleep(6) # total 12
         self.assertRaises(ValueError, w1.result)
         assert not w3.done()
-        time.sleep(4) # total 10
+        time.sleep(8) # total 20
         self.assertRaises(ValueError, w3.result)
 
     def test_connect(self):