Remove is <int>

It does not match orthodox python style.
And trigger warnings:
  cqlengine/query/test_queryoperators.py:157: SyntaxWarning: "is" with 'int' literal. Did you mean "=="?
    self.assertTrue(len(first_page) is 1)

tests/integration/cqlengine/__init__.py

@@ -77,10 +77,10 @@ def wrapped_function(*args, **kwargs):
             # DeMonkey Patch our code
             cassandra.cqlengine.connection.execute = original_function
             # Check to see if we have a pre-existing test case to work from.
-            if len(args) is 0:
-                test_case = unittest.TestCase("__init__")
-            else:
+            if args:
                 test_case = args[0]
+            else:
+                test_case = unittest.TestCase("__init__")
             # Check to see if the count is what you expect
             test_case.assertEqual(count.get_counter(), expected, msg="Expected number of cassandra.cqlengine.connection.execute calls ({0}) doesn't match actual number invoked ({1})".format(expected, count.get_counter()))
             return to_return

tests/integration/cqlengine/query/test_queryoperators.py

@@ -154,6 +154,6 @@ def test_named_table_pk_token_function(self):
         query = named.all().limit(1)
         first_page = list(query)
         last = first_page[-1]
-        self.assertTrue(len(first_page) is 1)
+        self.assertTrue(len(first_page) == 1)
         next_page = list(query.filter(pk__token__gt=functions.Token(last.key)))
-        self.assertTrue(len(next_page) is 1)
+        self.assertTrue(len(next_page) == 1)

tests/integration/standard/test_connection.py

@@ -182,7 +182,7 @@ def wait_for_connections(self, host, cluster):
         while(retry < 300):
             retry += 1
             connections = self.fetch_connections(host, cluster)
-            if len(connections) is not 0:
+            if connections:
                 return connections
             time.sleep(.1)
         self.fail("No new connections found")
@@ -192,7 +192,7 @@ def wait_for_no_connections(self, host, cluster):
         while(retry < 100):
             retry += 1
             connections = self.fetch_connections(host, cluster)
-            if len(connections) is 0:
+            if not connections:
                 return
             time.sleep(.5)
         self.fail("Connections never cleared")