Correct check_database_reachable() setup check
Summary: This corrects a bug in how I was checking for database connectivity on startup. For simplicity, I just changed from an array of connections to a single connection. Down the road when we build out database clustering this'll be something we need to revisit, but it's safe to ignore for now.
>>> import simplex >>> from simplex.application.config import setup_check >>> _tmp = setup_check.SimplexDatabaseSetupCheck(simplex.SIMPLEX_ENV) >>> _tmp.issues 
Reviewed By: brooke
Differential Revision: https://phabricator.tbmh.org/D22