Update SVR4 factory to avoid conflict with IPS factory

Some months ago, Christopher Kampmeier built an pkg(5)-based distribution of 
OpenDS (refer to http://blogs.sun.com/middle/entry/opends_in_ips_format_using) 
Introduction of SVR4 factory for 1.2 has broken this experimentation.
This modification renames some ant variables of the SVR4 factory so that they 
no longer conflict with names used in the Update Center toolkit. 
This is a first step for integrating the IPS factory in the OpenDS project.