Use new AzureML runtime by default

This is a bug fix release. Most significant update is that hi-ml-azure submits jobs targeting the new AzureML runtime by default now.

What's Changed

• MNT: Fix YAML syntax for Amulet jobs by @fepegar in #624
• MNT: Replace print with logging.info by @fepegar in #623
• FIX: Fix test_get_dataset by @mebristo in #636
• ENH: Switch to new AzureML runtime by @ant0nsc in #576

Full Changelog: v0.2.7...v0.2.8