Summary:
Move the integration tests from eden/fs/integration up one directory, to
eden/integration.
The main benefit is that this makes it easy to run just the edenfs unit tests
by running "buck test eden/fs/...". These unit tests complete much more
quickly than the full set of integration tests, providing a faster test suite
to re-run repeatedly during development. The integration tests can be run with
"buck test eden/integration/...", and the full set of tests can still be run
with "buck test eden/..."
Reviewed By: wez
Differential Revision: D4490247
fbshipit-source-id: 5ceb5a19526f56e1cb926f352fa30ad2f1212c05