add Solr fields to importer-solr.py

[briesenberg07]

Per LS there are other Solr fields helpful for checking importer status...

...visibility? One that tells whether a work has been approved?? Having a hard time picking these out from the many many fields in OD Solr schema

[lsat12357]

for spotting problems with filesets:

• thumbnail_path_ss #should look like "/downloads/f0h989r509h?file=thumbnail"
• file_set_ids_ssim #usually the object pid with "f0" in front

for spotting problems with object status

• suppressed_bsi #will be true until successfully reviewed
• workflow_state_name_ssim # will be "review pending" or "deposited" or (empty if really messed up)

visibility_ssi #may get set to private if the workflow does not successfully complete