Sensu 2.0 Beta Release 6

This release is the sixth beta release of Sensu 2.0. It was tagged from the master branch, SHA 05af2ca.

This release is chock full of bug fixes, enhancements and goodness! The Changelog with the exhaustive list can be found here.

**This is a source-only release [no packages published].
Source can be found here.

Known Issues:

• Inconsistency in keepalive failures #2190
• Adhoc checks with assets do not retrieve dependencies #2201