Apply a hack to unbreak bin/storage upgrade across the DB config boundary

Summary: This is gross, but fixes an issue where bin/storage upgrade tries to access DB config which doesn't exist yet. We need a version of this for bin/config anyway. I'll sort this out into a proper sequenced startup process in a followup.

Test Plan: bin/storage upgrade no longer fatals when upgrading across the config boundary.

Reviewers: asherkin, codeblock, btrahan, vrana

Reviewed By: codeblock

CC: aran

Differential Revision: https://secure.phabricator.com/D4512