[20190323224840] Local Rack Release Updates

[ddollar]

This release allows for release logs and automatic rollback of failed promotions on the local Rack.

• #3185 rework local log store [@ddollar]
• #3186 promotion timeout and automated rollback [@ddollar]
• #3187 support rollback during start [@ddollar]
• #3188 make tests more verbose [@ddollar]