Fix test_restrictions with Python 2.6 (#619)
Fix test_restrictions with Python 2.6 (#619)

Summary:
Commit ef6948ba5b added some uses of str.format, but the format strings
don't work with Python 2.6. This causes the test_restrictions test to
fail on Travis CI. Make the format strings compatible with Python 2.6 to
make the build green again.
Closes https://github.com/facebook/watchman/pull/619

Reviewed By: wez

Differential Revision: D8741560

Pulled By: strager

fbshipit-source-id: c2a652b2288343bba9b64871f4a1498bb32311d6

facebook/watchman,facebook/watchman,wez/watchman,facebook/watchman,nodakai/watchman,wez/watchman,wez/watchman,wez/watchman,facebook/watchman,wez/watchman,wez/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,wez/watchman,nodakai/watchman,nodakai/watchman,wez/watchman