Make view updater couch_work_queue configurable
Make view updater couch_work_queue configurable

For performance reasons in some cases there is a need to put a cap
on a queue size.

COUCHDB-3005

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb