Create CI-sized DECam Dataset

Create a dataset (in the Reiss sense) that is a subset of ap_verify_hits2015 for use in CI. The dataset must contain multiple visits to the same location in order to test source association, and should have at most ~10 images. See discussion on #dm for more details.

In addition to containing only a subset of raw images, the new dataset should contain only those templates that are necessary to process the subset. Unfortunately the only way I know of to figure out which templates get used is to run the pipeline and parse the log output.