Add support for getting the list of active slices on each CM. The
listusage script gets the list of CMs from the clearinghouse DB, and calls the ListUsage() method on each one. The return is a list of slices (gids) and for each slice, a list of slivers that represent nodes. Currently just for debugging other CMs, but eventually will be used to populate the clearinghouse DB with an informational snapshot of the federation.
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