Add anchore to the pipeline

Added the anchore stage to the pipeline. The anchore stage will reach out and scan the image based off of the image id. Using the image id will ensure that the specific image associated with that pipeline run will be returned. I also added the anchore_timeout and twistlock_timeout as pipeline variables so that they can be tuned without having to check in new code. I also added an anchore_debug pipeline variable so that debug output can be turned off and on quickly. We may want to consider having a global debug pipeline variable that will turn on debug output for when we are working on the pipeline.