The method being changed constructs domain-related parameters that will
further be passed to the auth plugin. If project domain is not
passed, the method sets it to the default domain.
token_endpoint does not expect any information about domain,
because it uses only a token and URL. Passing it to auth plugin causes
an exception.
Construct domain-related parameters only for specific plugins, such
as password or totp.
Change-Id: I13db3bbe31a0ed843e9f4528d37c768546e2bee9
Closes-Bug: 1642301
e51a8d6374