logging: Mock logging so a test log doesn't go to logs/
logging: Mock logging so a test log doesn't go to logs/

Summary:
The FabricApplication test was printing out an actual log to logs/foo.log.
We don't want to have bogus logs there, so I mocked out the logging
for the FabricApplication test.

Task: cleanup
Review Url: @@review_url@@

Test Plan: make clean lint test-all

Reviewers: anu, rschlussel

Reviewed By: anu, rschlussel

Subscribers: mf186042, rschlussel

Differential Revision: https://phabricator.td.teradata.com/D214

prestodb/presto-admin,Svjard/presto-admin,Svjard/presto-admin,prestodb/presto-admin