MB-6046: Give out hints about node failover
MB-6046: Give out hints about node failover

Solely based on "Connection reset by peer", we cannot tell if it is
a node failover or a temporary network problem. Still keep the current
logic but give out a node failover hint.

Change-Id: I2eeb2f64e2a8344d10fa7a510de3d95cd5b1df12
Reviewed-on: http://review.couchbase.org/20600
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Reviewed-by: Farshid Ghods <d156f4d6e0bf45f921ca8075152c6b766c6853a7@couchbase.com>

membase/membase-cli,membase/membase-cli,couchbase/couchbase-cli,couchbaselabs/couchbase-cli,couchbase/couchbase-cli,couchbaselabs/couchbase-cli,couchbaselabs/couchbase-cli,membase/membase-cli