Fix import of shlex_quote

the backport here 1f3f4cf702 forgot that
in ansible-2.3, the six library in ansible.module_utils is only 1.4.
1.4 doesn't have shlex_quote.  Importing it from ansible.compat works
for ansible-2.3.

lib/ansible/playbook/play_context.py

@@ -32,8 +32,6 @@ from ansible.compat.six import iteritems, string_types
 from ansible.compat.six.moves import shlex_quote
 from ansible import constants as C
 from ansible.errors import AnsibleError
-from ansible.module_utils.six import iteritems
-from ansible.module_utils.six.moves import shlex_quote
 from ansible.module_utils._text import to_bytes
 from ansible.playbook.attribute import FieldAttribute
 from ansible.playbook.base import Base