Allow dynamic groupSearchFilter in LdapGroupsMapping

As of now the lookupGroup() method doesn't allow to have placeholders in 

groupSearchFilter, so that can not be dynamically adjusted.

If we have placeholders for groupSearchFilter like: (&(|(XYZ={0})(ABC={1}))(objectClass=posixGroup))

This fails here:

groupResults =
    c.search(groupbaseDN,
        "(&" + groupSearchFilter + "(" + groupMemberAttr + "={0}))",
        new Object[]{userDn},
        SEARCH_CONTROLS); 

With 

javax.naming.directory.InvalidSearchFilterException: number exceeds argument list: 1; remaining name 

>>Dropped off or changed the details above which I thought won't be safe to disclose.