move integration tests to eden/integration

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

tests/integration/TARGETS

@@ -115,7 +115,7 @@ python_unittest(
       ':testsupport',
       '@/watchman/python/pywatchman:pywatchman',
       '@/watchman:watchman',
-      '@/eden/fs/integration/lib:lib',
+      '@/eden/integration/lib:lib',
       '@/eden/fs/service:edenfs',
       '@/eden/fs/cli:cli',
     ],

tests/integration/WatchmanEdenTestCase.py

@@ -18,7 +18,7 @@
 
 TestParent = object
 try:
-    from eden.fs.integration.lib import (edenclient, hgrepo)
+    from eden.integration.lib import (edenclient, hgrepo)
 
     def is_sandcastle():
         return 'SANDCASTLE' in os.environ