Create log directory if it does not exist
Summary: Create log directory if it does not exist. In particular, I want to check log.access.path if it does not exist.
Test Plan: Saw the log directory created.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11729