Simplify stage naming convention

[AlexIoannides]

Background
Currently, stages are named using the following convention:

PROJECT_NAME--STAGE_NAME

This can lead to very long service URLs. Given that the namespace is now nearly always PROJECT_NAME, we should simplify the stage name to be just STAGE_NAME, so that a service URL becomes something along the lines of,

http://CLUSTER_IP/weather-prediction/service/.../...

This may require a modification to the chosen fields in bw deployment display to make it obvious from which project the deployments come from.