Add a config option to specify how many cursors to request per collection for parallel collection scans.  Parallel collection scans are currently only supported in the mmapv1 storage engine.  Should the WiredTiger storage engine support them in the future this param should take effect without an upgrade of Monstache.
Add a config option to specify how many cursors to request per
collection for parallel collection scans.  Parallel collection scans are
currently only supported in the mmapv1 storage engine.  Should the
WiredTiger storage engine support them in the future this param should
take effect without an upgrade of Monstache.

rwynn/monstache,rwynn/monstache