MAN: Misspelled username in pam_trusted_users is not fatal
    
    The man page claimed that failing to resolve an user name results in
    failure to start SSSD, but it's not the case and shouldn't be, because
    marking a user as trusted only elevates privileges, so it's safe to
    ignore that failure.
    
    https://fedorahosted.org/sssd/ticket/2530
    
    Reviewed-by: Pavel Reichl <preichl@redhat.com>