Verify contents of compiled package blobs in integration tests

Signed-off-by: Phan Le <ple@pivotallabs.com>
Rename index.json to compiled_packages.json

Signed-off-by: Phan Le <ple@pivotallabs.com>
Parse job properties from job manifest

Signed-off-by: Phan Le <ple@pivotallabs.com>