Provide a non-interactive mode for maintenance
Provide a non-interactive mode for maintenance

When adding or replacing nodes in a cluster we often don't want them to
be participating in read/write, view, or changes requests. This just
rejects all RPC calls that have an IO class of interactive.

BugzId: 18955

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