Port all the Analytics Refinery code to Python 3.
The following bin scripts need to be reviewed/tested and moved to `#!/usr/bin/env python3`
```
camus:#!/usr/bin/env python
download-project-namespace-map:#!/usr/bin/env python
generate-domain-abbrev-map:#!/usr/bin/env python
is-yarn-app-running:#!/usr/bin/env python
refinery-drop-banner-activity-partitions:#!/usr/bin/env python
refinery-drop-druid-deep-storage-data:#!/usr/bin/env python
refinery-drop-eventlogging-partitions:#!/usr/bin/env python
refinery-drop-hive-partitions:#!/usr/bin/env python
refinery-drop-hourly-partitions:#!/usr/bin/env python
refinery-drop-mediawiki-snapshots:#!/usr/bin/env python
refinery-drop-older-than:#!/usr/bin/env python
refinery-drop-webrequest-partitions:#!/usr/bin/env python
refinery-get-add-webrequest-partition-statements:#!/usr/bin/env python
refinery-oozie-rerun:#!/usr/bin/env python
saltrotate:#!/usr/bin/env python3
sequence-file:#!/usr/bin/env python
```