Now, keystone has supported serverl auth method, like 'totp'.
Before we use this method, we should create the credential first.
And we need create it with type 'totp'. But now we cannot create
credential with this method.
Also, I think the type should not have constrains. We can create
any type in keystone project. So, we should do these actions too.
The type would be more which We cannot control.
Change-Id: Ie0482da3133fb515e4bb8e45f8c54f509589cc5e
Closes-bug: #1731848
0f749cacc2