[EnMasse] 0.15.0 released

[Ulf Lilleengen]

Hi all,

EnMasse 0.15.0 has been released! The work since last release has been 
focused around features required for production environments. Changes 
since last release include:

* Use persistent volumes for standard authentication service/keycloak
* Add cluster roles that limit privileges required to run address controller
* Add HTTPS support for standard authentication service
* Support multiple address controllers on the same cluster
* Enable HTTPS for REST API and console
* Authenticate REST API using RBAC
* Move REST API path from /v1 to /apis/enmasse.io/v1 to support 
aggregated API service
* Upgrade broker to Apache Artemis 2.4.0
* Upgrade keycloak to 3.3.0
* Lots of bug fixes to console
* Replace use of Ingress with LoadBalancer Service

18 
[issues](https://github.com/EnMasseProject/enmasse/milestone/5?closed=1) 
has been resolved since
last release.

Thanks,

Ulf