Add camus infrastructure to handle webrequests

  We bring the camus wrapper script and the properties file for
  webrequest handling over from the analytics/kraken repository's
  kraken-etl directory (HEAD there is currently at
    de4346e72863b95a80ace59af5f200a10759549c
  ).
  The EventLogging properties file is not yet brought over, as
  kafka does currently not handle EventLogging data.

Change-Id: Ib95574923e596888eb85c6a515df3b06c7420447