Currently we are randomizing each line in ros_ocp data when dataset is generated using Nise. This task will add a param to enable/disable the constant value generation so we(ros-ocp qe) can use it for generating notifications for our ros-ocp tests

This will combine efforts present under following PRs:

• https://github.com/project-koku/nise/pull/512/files
• https://github.com/project-koku/nise/pull/502/files