Use account name for user_group, multiple auth_methods at same time

- tempurl/formpost user group should use the account name, not the account id
- it is now supported to use multiple auth methods at the same time (for example keystone and swauth)
- refactoring (create_alias_container not create_target_container) and bugfix ({old|new}_account now empty list if read or write acl not set)
- the keystone token can be invalidated, so it is required to reauthenticate in some cases