module_utils/ansible_ipa_client.py: Fix client module util to work with python3

module_utils/ansible_ipa_client.py

@@ -42,6 +42,8 @@ if NUM_VERSION >= 40400:
     import inspect
     import logging
 
+    import six
+
     try:
         from ipaclient.install import ipadiscovery
     except ImportError:
@@ -154,6 +156,9 @@ if NUM_VERSION >= 40400:
 
     from ipapython.ipautil import realm_to_suffix, run
 
+    if six.PY3:
+        unicode = str
+
     try:
         from ipaclient.install import ntpconf
     except ImportError: