Ensure hosts aren't duplicated in groups

lib/ansible/inventory/data.py

@@ -231,7 +231,7 @@ class InventoryData(object):
         else:
             h = self.hosts[host]
 
-        if g and host not in g.get_hosts():
+        if g and h not in g.get_hosts():
             g.add_host(h)
             self._groups_dict_cache = {}
             display.debug("Added host %s to group %s" % (host, group))

lib/ansible/inventory/group.py

@@ -112,7 +112,8 @@ class Group:
             raise AnsibleError("The group named '%s' has a recursive dependency loop." % self.name)
 
     def add_host(self, host):
-
+        if host in self.hosts:
+            return
         self.hosts.append(host)
         host.add_group(self)
         self.clear_hosts_cache()