Fix integration spec

After buildpacks get cloned outside app dir,
the size of droplet is decreased.
Dea publishes droplet exit status, description during crash.
Set exit status and exit description before state change.
Remove stale comment
Merge branch 'master' of https://github.com/limengyun2008/dea_ng into dev
add java python buildpack
Merge branch 'dev' of https://github.com/youdao-cf/dea_ng into dev