Consider usage logs for cached vocabs in planning

[sfolsom]

@eichmann provided the following:

22 /pcc_batch.jsp
88 /share_vde/uwashington_batch.jsp
89 /share_vde/frick_batch.jsp
90 /share_vde/harvard_batch.jsp
103 /isni_live_batch.jsp
119 /nalt_batch.jsp
121 /ligatus_batch.jsp
126 /dbpedia_name_batch.jsp
163 /loc_demographics_batch.jsp
248 /loc_subject_batch.jsp
249 /loc_cultural_organizations_batch.jsp
286 /isni_batch.jsp
292 /homosaurus_batch.jsp
348 /loc_performance_batch.jsp
359 /share_vde/nlm_batch.jsp
361 /share_vde/ransom_batch.jsp
364 /agrovoc_batch.jsp
366 /share_vde/ucdavis_batch.jsp
375 /loc_countries_batch.jsp
386 /mesh_batch.jsp
439 /cerl_batch.jsp
547 /loc_genre_batch.jsp
587 /fast_batch.jsp
703 /loc_name_batch.jsp
987 /loc_rwo_name_batch.jsp
1006 /geonames_batch.jsp
3593 /getty_batch.jsp
4204 /rda_batch.jsp
4509 /loc_vocab_batch.jsp