Merge pull request #1793 from thaJeztah/18.09_backport_fix_circle_vendor_flakiness

[18.09 backport] CircleCI: Increase no-output timeout to 15 minutes for vendoring

circle.yml

@@ -87,6 +87,7 @@ jobs:
             docker build -f dockerfiles/Dockerfile.dev --tag cli-builder-with-git:$CIRCLE_BUILD_NUM .
             docker run --rm cli-builder-with-git:$CIRCLE_BUILD_NUM \
                 make ci-validate
+          no_output_timeout: 15m
   shellcheck:
     working_directory: /work
     docker: [{image: 'docker:18.03-git'}]