Fix parameters in exception handling

Fix parameters in exception handling

The commit d9155521539e5e67f0984c180267fc91cc17c738 added
exceptions with one too many %.

The format should be as follows:

class ExceptionExample(exceptions.NeutronException):
    message = _('Invalid input %(input)s')

It is called by raise.ExceptionExample(input=input)

The patch also fixes a typo with InvalidAuthenticationTypeExecption.

Change-Id: I0f796fbe0eb029277250ae82c3d7f75842364f76