[cloud-mapper] - Setup paths for cloud mapper.
[cloud-mapper] - Setup paths for cloud mapper.

Workers run in AppEngine in managed VM's, which trigger this check and it ends up that they don't get paths setup properly. They have full access to the filesystem though, and call out to gce_instance_map_job and so they need all the paths setup properly.

BUG=catapult:#1774

Review URL: https://codereview.chromium.org/1461053004

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