Diego v0.1439.0

Changes from v0.1438.0 to v0.1439.0

• Depends on garden-linux-release v0.316.0.
• Depends on etcd-release 18.

Significant changes

• Errors about invalid DesiredLRPs should not prevent the nsync-bulker from bumping the cf-apps domain
• Auctioneer should distribute tasks as evenly as possible
• Auction state requests should time out after 1s by default
• As a Diego developer, I expect to run the 'upgrade-from-stable' suite in CI against a new BOSH-Lite instance provisioned on AWS
• pivotal-golang/lager #16: Use Reader instead of Scanner to avoid large token issue
• Update cflinuxfs2 rootfs to 1.15.0+

BOSH property changes

• Add diego.auctioneer.cell_state_timeout: Duration for the auctioneer to wait before timing out state requests to cells. Defaults to "1s".
• Add diego.executor.max_concurrent_downloads: Number of concurrent downloads/stream-ins to allow the executor to perform at once. Defaults to "5".