fix unit test when memcache middleware is not configured

Fixes:

keystoneclient.middleware.auth_token: INFO: Starting keystone auth_token middlewa
re
keystoneclient.middleware.auth_token: INFO: Using /opt/stack/keystone/examples/pk
i/certs as cache directory for signing certificate
keystoneclient.middleware.auth_token: DEBUG: Authenticating user token
keystoneclient.middleware.auth_token: DEBUG: Removing headers from request enviro
nment: X-Identity-Status,X-Tenant-Id,X-Tenant-Name,X-User-Id,X-User-Name,X-Roles,
X-Service-Catalog,X-User,X-Tenant,X-Role
keystoneclient.middleware.auth_token: DEBUG: Keystone did not return json-encoded
 body
keystoneclient.middleware.auth_token: DEBUG: Marking token invalid-token as unaut
horized in memcache
keystoneclient.middleware.auth_token: DEBUG: Token validation failure.
Traceback (most recent call last):
  File "/opt/stack/python-keystoneclient/keystoneclient/middleware/auth_token.py"
, line 574, in _validate_user_token
    data = self.verify_uuid_token(user_token, retry)
  File "/opt/stack/python-keystoneclient/keystoneclient/middleware/auth_token.py"
, line 824, in verify_uuid_token
    self._cache_store_invalid(user_token)
  File "/opt/stack/python-keystoneclient/keystoneclient/middleware/auth_token.py"
, line 794, in _cache_store_invalid
    self._cache_store(token, 'invalid')
  File "/opt/stack/python-keystoneclient/keystoneclient/middleware/auth_token.py"
, line 771, in _cache_store
    timeout=self.token_cache_time)
TypeError: set() got an unexpected keyword argument 'timeout'
keystoneclient.middleware.auth_token: DEBUG: Marking token invalid-token as unaut
horized in memcache

This can be reproduced on devstack.

Fixes bug 1102520

Change-Id: Ib9e110d60df40e30d74c3059bd25e459a95f9850
Merge "fix unit test when memcache middleware is not configured"