This commit Add support for cap_add & cap_drop which maps to
Pod.Spec.Container.SecurityContext.Capabilities.Add/Drop
Added unit tests for ConfigCapabilities function
Updated conversion.md on support for these keys
This adds a document regarding all the values which are converted from
Docker Compose to Kubernetes / OpenShift. Adding both notes as well as
the value that docker-compose is mapped to in Kubernetes / OpenShift.