Bug 681345 - setup-ds.pl should set SuiteSpotGroup automatically
    
    When the SuiteSpotGroup directive is not specified in the inf file
    used by setup, the group permissions do not get set on certain
    directories (such as the rundir).  This can break instances if you
    are running more than one on the same system.
    
    This patch makes setup use the primary group of the SuiteSpot
    user if the group is not specified.  I also added validation of
    the group parameter.