Simplify session logger object tests

With the requests-mock logger now configured to log the request[1],
checking that the logger output does *not* contain the request is
invalid. Simplify these two tests by omitting the assertion.

[1] jamielennox/requests-mock#93

Closes-bug: #1842978

Change-Id: If3c0447502917bce831d3e9f7ae4c31374dd4380

keystoneauth1/tests/unit/test_session.py

@@ -1199,7 +1199,6 @@ def test_logger_object_passed(self):
         self.assertIn(list(response.keys())[0], output)
         self.assertIn(list(response.values())[0], output)
 
-        self.assertNotIn(self.TEST_URL, self.logger.output)
         self.assertNotIn(list(response.keys())[0], self.logger.output)
         self.assertNotIn(list(response.values())[0], self.logger.output)
 
@@ -1550,7 +1549,6 @@ def test_logger_object_passed(self):
         self.assertIn(list(response.keys())[0], output)
         self.assertIn(list(response.values())[0], output)
 
-        self.assertNotIn(self.TEST_URL, self.logger.output)
         self.assertNotIn(list(response.keys())[0], self.logger.output)
         self.assertNotIn(list(response.values())[0], self.logger.output)