Speed up record attribute ingest

Speed up record attribute ingest

A huge number of rows (700+) have been added to
config.record_attr_definition in recent versions of Evergreen. However,
these rows do not actually define any indexing at all, but are used for
other purposes.  The reingest process currently churns over all of these
rows to ultimately do nothing.

This commit limits the group of attributes considered at ingest to only
those which might index something.  Testing indicates a substantial
speed boost to typical use of metabib.reingest_record_attributes()
(over 7x speedup).

Signed-off-by: Dan Wells <dbw2@calvin.edu>