As_AHost role does not exist.
Merge branch 'release-5.0.0' into develop
Merge remote-tracking branch 'origin/release-5.0.0' into develop

Conflicts:
	src/NServiceBus.Core/Hosting/Roles/RoleManager.cs
Merge branch 'release-5.0.0' into develop
Merge branch 'release-5.0.0' into develop
Added Encoding as configurable property of JsonMessageSerializer
Merge branch 'develop' of https://github.com/SzymonPobiega/NServiceBus into SzymonPobiega-develop
Updated api to not use fluent.