Minor Description
When given a source file of items to copy, the CopyFiles utility tries each of its supported schemes in turn looking for matching entries in the passed file. Of the 4 schemes – file, hdfs, http, and s3 – we never make it to the s3 test. We skip out early. Also, even if we did make it to the search-for-s3-URLs code, the list of s3 srcPaths would always be empty because of a copy/paste error.