Currently, we can get scoped token (domain scoped, project scoped)
as well as unscoped token.
When we use OSC to get a domain scoped token without explicitly set
domain information, the hint message show us we need to set a scoped
domain or project, but it miss that the parameters to be set in order
to get project or domain scoped token is not the same.
Thus, the hint message could be improved to make it more clear to
end user.
Change-Id: I94768c619b30be18737fec189ae6d81e81ba090d
9f69b43f5a