Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).


More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug.
recipe_engine:
  https://crrev.com/e7bbbf6cfac944157d80cc92fd78837165e69d3f Fix a race crash when recipe expectations directory exists (phajdan.jr@chromium.org)


TBR=iannucci@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I3686b56ed29c3333f77feee0118a5020acb73abf
Reviewed-on: https://chromium-review.googlesource.com/499603
Reviewed-by: <recipe-roller@chromium.org>
Commit-Queue: <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -15,7 +15,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "497f5b7f92cea8e5273d56cc3cba876fb18b42d9",
+      "revision": "e7bbbf6cfac944157d80cc92fd78837165e69d3f",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },