Add missing import in ansible.cli

lib/ansible/cli/__init__.py

@@ -33,6 +33,7 @@ from ansible import __version__
 from ansible import constants as C
 from ansible.errors import AnsibleError, AnsibleOptionsError
 from ansible.utils.unicode import to_bytes
+from ansible.utils.display import Display
 
 class SortedOptParser(optparse.OptionParser):
     '''Optparser which sorts the options by opt before outputting --help'''