Bug #3437 Ini installer broken in master

Remove references to these attributes factory options
 - "use_vofrontend_proxy"
 - "x509_proxy"
 - "x509_gsi_dn"
.
Removed these methods and use of them:
 - def use_vofrontend_proxy(self):
 - def x509_proxy(self):
 - def x509_gsi_dn(self):
.
This should bring the module back to where it was before the bad merge on Dec28.