Clear solr index prior to ingesting data in door_import.sh

Use:

curl http://solrcloud.galib.uga.edu:8983/solr/galileo-staging/update?commit=true -d '<delete><query>*:*</query></delete>' if staging

otherwise:

curl http://localhost:9983/solr/galileo_admin-{ENVIRONMENT}/update?commit=true -d '<delete><query>*:*</query></delete>'