SENTRY-574: Add Sentry solr handler (Prasad Mujumdar via Gregory Chanan)
SENTRY-398: Generic authorization model for Sentry (shenguoquan via Arun Suresh)
sentry-479: Create a Solr client to interactive with the sentry service
sentry-480:Create import tool that will load policy file about Solr into into the DB store
sentry-481:Add Solr e2e test for integrating with DB store