Only put paused conns back into downstream conn pool
Only put paused conns back into downstream conn pool

Otherwise, if moxi releases a downstream conn that's not paused,
close that conn.

Change-Id: I8801114c174023e2dfbf2f6fa7bfe3eb0ca06b22
Reviewed-on: http://review.membase.org/3739
Tested-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>
Reviewed-by: Chiyoung Seo <8b279095f11c26cc21045fda5a3e51debb005aa9@gmail.com>

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