Try to cancel a replication everywhere
Try to cancel a replication everywhere

Cancelation requests sometimes omit source and target information in
favor of a replication ID.  When that happens the logic that selects the
owner for the replication picks the wrong node, and the cancelation
fails with a not_found error.  This patch causes the request to be
submitted to all nodes in the cluster.  We report success if at least
one node reports success, otherwise we report (one of) the errors that
we received.

BugzID: 21976

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