move attributes of v3.client.Client into alphabetical order

Just make self.users be consistent with the other assignments.

Change-Id: Ib3053774e9dd905eb4ef50668d6638ce19750177

keystoneclient/v3/client.py

@@ -141,10 +141,6 @@ EndpointFilterManager`
 
         :py:class:`keystoneclient.v3.services.ServiceManager`
 
-    .. py:attribute:: users
-
-        :py:class:`keystoneclient.v3.users.UserManager`
-
     .. py:attribute:: tokens
 
         :py:class:`keystoneclient.v3.tokens.TokenManager`
@@ -153,6 +149,10 @@ EndpointFilterManager`
 
         :py:class:`keystoneclient.v3.contrib.trusts.TrustManager`
 
+    .. py:attribute:: users
+
+        :py:class:`keystoneclient.v3.users.UserManager`
+
     """
 
     version = 'v3'
@@ -174,9 +174,9 @@ EndpointFilterManager`
         self.role_assignments = role_assignments.RoleAssignmentManager(self)
         self.roles = roles.RoleManager(self)
         self.services = services.ServiceManager(self)
-        self.users = users.UserManager(self)
         self.tokens = tokens.TokenManager(self)
         self.trusts = trusts.TrustManager(self)
+        self.users = users.UserManager(self)
 
         # DEPRECATED: if session is passed then we go to the new behaviour of
         # authenticating on the first required call.