[20190520160559] Local Registry Unidling, Bug Fixes

[ddollar]

Notes

• Fixes an issue with the local Rack where the registry was not unidling correctly in some cases
• Prevents promotion of a release that has no manifest

Pull Requests

• #3250 refactor endpoint wait [@ddollar]
• #3251 dont use storage for idle state [@ddollar]
• #3252 prevent promotion of a release with an empty manifest [@ddollar]