Fix rootPath in vendor.json
Fix rootPath in vendor.json

Signed-off-by: Alpha Chen <7364008dc3be68102ea8f9d7e1fdcc07eb756637@pivotal.io>

cloudfoundry-community/stackdriver-tools,cloudfoundry-community/stackdriver-tools,cloudfoundry-community/stackdriver-tools,cloudfoundry-community/stackdriver-tools