have been removed from requisitions, at least according to this log:
2012-11-08 04:10:47,673 WARN [scanExecutor-20] Requisition: The non-ip-interfaces field was deprecated in 1.6, and removed in 1.8. Ignored.
2012-11-08 04:10:47,788 WARN [scanExecutor-12] Requisition: The non-ip-snmp-primary field was deprecated in 1.6, and removed in 1.8. Ignored.
Yet newly created requisitions contain them. Furthermore, if you remove them from the .xml file, when an import (synchronize) is performed, the requisition is marshalled back to the file system and they are added back.