Add detailed  'check-build-results' script
Add detailed  'check-build-results' script

Gives detailed information on the step functsions and intermediate jobs,
including ec2 instance IDs that can be correlated

Example output: https://gist.github.com/fredemmott/3963780a0b87bcd4ba4038c97a927422

hhvm/packaging,hhvm/packaging,hhvm/packaging