Strip configured fields during import/overlay II

Strip configured fields during import/overlay II

Support on-demand and always-apply strip groups.  Move stripping out to
shared util function.

Specifically, this adds support for optional strip-groups to these APIs:

open-ils.cat.biblio.record.xml.create
open-ils.cat.biblio.record.marc.replace
open-ils.cat.biblio.record.xml.import
open-ils.vandelay.bib_record.list.import
open-ils.vandelay.bib_queue.import

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>