R1:aa3e95cbeb80

Cache connection in bin/storage

Summary: Connection takes .3s from dev server to master.

Test Plan:
$ bin/storage --trace upgrade --namespace x
$ bin/storage --trace destroy --namespace x

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4480