Remove service.start_container()

It has been an unnecessary wrapper around container.start() for a little while now, so we can call it directly.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

tests/integration/cli_test.py

@@ -599,7 +599,7 @@ class CLITestCase(DockerClientTestCase):
     def test_restart(self):
         service = self.project.get_service('simple')
         container = service.create_container()
-        service.start_container(container)
+        container.start()
         started_at = container.dictionary['State']['StartedAt']
         self.command.dispatch(['restart', '-t', '1'], None)
         container.inspect()