library/ipahost.py: Fix ipahost to work with Python3

library/ipahost.py

@@ -155,6 +155,7 @@ host:
 '''
 
 import os
+import six
 
 from ansible.module_utils.basic import AnsibleModule
 
@@ -162,6 +163,9 @@ from ipalib import api, errors
 from ipaplatform.paths import paths
 from ipapython.ipautil import run
 
+if six.PY3:
+    unicode = str
+
 def get_host_diff(ipa_host, module_host):
     """
     Compares two dictionaries containing host attributes and builds a dict