refactor: Load connection info asynchronously. #426
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The Mysql and Postgres drivers require that their options.stream function immediately return a socket.
This refactors the connector so that it can return a SocketWrapper immediately, then delay the
connection of that socket until the asynchronous refresh operation finishes.
This will improve startup time for applications. This enable customers to use the standard host configuration
property instead of the Cloud SQL property "instance connection name". This will enable us to build lazy refresh
for the NodeJS connector.