Only attempt deploys on appropriate shards. (#4816)
Only attempt deploys on appropriate shards. (#4816)

This averts deploy errors on shards that have not populated
`build-support/bin/native/s3-upload`.

Fixes #4815
foursquare/pants,UnrememberMe/pants,UnrememberMe/pants,benjyw/pants,benjyw/pants,UnrememberMe/pants,fkorotkov/pants,15Dkatz/pants,wisechengyi/pants,fkorotkov/pants,twitter/pants,benjyw/pants,pantsbuild/pants,baroquebobcat/pants,baroquebobcat/pants,twitter/pants,tdyas/pants,fkorotkov/pants,foursquare/pants,tdyas/pants,foursquare/pants,baroquebobcat/pants,twitter/pants,15Dkatz/pants,foursquare/pants,fkorotkov/pants,UnrememberMe/pants,baroquebobcat/pants,tdyas/pants,jsirois/pants,foursquare/pants,pantsbuild/pants,wisechengyi/pants,foursquare/pants,fkorotkov/pants,jsirois/pants,fkorotkov/pants,tdyas/pants,fkorotkov/pants,tdyas/pants,benjyw/pants,baroquebobcat/pants,tdyas/pants,wisechengyi/pants,15Dkatz/pants,fkorotkov/pants,foursquare/pants,twitter/pants,tdyas/pants,UnrememberMe/pants,15Dkatz/pants,wisechengyi/pants,wisechengyi/pants,15Dkatz/pants,pantsbuild/pants,baroquebobcat/pants,baroquebobcat/pants,UnrememberMe/pants,twitter/pants,wisechengyi/pants,benjyw/pants,15Dkatz/pants,twitter/pants,baroquebobcat/pants,pantsbuild/pants,tdyas/pants,wisechengyi/pants,jsirois/pants,foursquare/pants,benjyw/pants,UnrememberMe/pants,UnrememberMe/pants,pantsbuild/pants,twitter/pants,pantsbuild/pants,15Dkatz/pants,baroquebobcat/pants,benjyw/pants,twitter/pants,UnrememberMe/pants,wisechengyi/pants,foursquare/pants,pantsbuild/pants,tdyas/pants,twitter/pants,wisechengyi/pants,15Dkatz/pants