Update end to end test to pass in TravisCI

Created by: nataliejameson

Fix issue where TravisCI sometimes does not recognize symlinks

This integration test works by checking what builds were invoked, and their UUIDs. For some reason on TravisCI (only), one of the two last_* links in buck-out/log are reporting 'true' for Files.isSymbolicLink, and it would cause last_querycommand and the UUID based dir to show up in the logs. Looking at the code in GlobalStateManager, this should work, but unblock travisci for now, since this test isn't failing anywhere else

Fixes #2229 (closed)