Support the plan attribute of tehe VCAP_SERVICES environment variable

[georgethebeatle]

Background

According to cf docs there should be a plan attribute in the VCAP_SERVICES env var that is set to the plan of the bound managed service instance

Acceptance

GIVEN I have an app that dumps the environment running on Korifi with a service instance bound to it
WHEN I access the app
THEN I can see that the plan attribute of the VCAP_SERVICES env var is set to the name of the service plan of the bound service

Dev Notes

• On cf for vms the plan attribute is not set for user provided service instances, so it is a managed-only feature