bug 1512 - use less deadlock prone pathway for simple cmd retries
bug 1512 - use less deadlock prone pathway for simple cmd retries

for simple ascii-2-binary commands (set, delete, single-key GET's),
use the upstream_retry counter signalling approach rather
than the fancy, more race-prone work queues.

Change-Id: Id6b34fe5cbec102ca280094d1261dc5d86eeae30
Reviewed-on: http://review.northscale.com:8080/812
Reviewed-by: Eric Lambert <7ef4e71cebb32cb5e304f9d7d27d812f8d7da939@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

couchbase/moxi,membase/moxi,couchbase/moxi,membase/moxi,zbase/moxi,membase/moxi,couchbase/moxi,membase/moxi,zbase/moxi,zbase/moxi,steveyen/moxi,couchbase/moxi,steveyen/moxi,zbase/moxi,steveyen/moxi,membase/moxi,couchbase/moxi,couchbase/moxi,steveyen/moxi,steveyen/moxi,membase/moxi,zbase/moxi