Meta server: fix possible "dead state" with rpc headers larger than 3KB resulting in permanent connection "hang", by shutting down read only if at least one op is in flight, or write pending.
Meta server: fix possible "dead state" with rpc headers larger than 3KB resulting in permanent connection "hang", by shutting down read only if at least one op is in flight, or write pending.

quantcast/qfs,fengshao0907/qfs,chanwit/qfs,fengshao0907/qfs,chanwit/qfs,quantcast/qfs,fengshao0907/qfs,fengshao0907/qfs,thebigbrain/qfs,thebigbrain/qfs,quantcast/qfs,quantcast/qfs,thebigbrain/qfs,fengshao0907/qfs,chanwit/qfs,quantcast/qfs,qnu/qfs,thebigbrain/qfs,fengshao0907/qfs,fengshao0907/qfs,chanwit/qfs,thebigbrain/qfs,chanwit/qfs,qnu/qfs,chanwit/qfs,qnu/qfs,chanwit/qfs,qnu/qfs,thebigbrain/qfs,quantcast/qfs,thebigbrain/qfs,chanwit/qfs,qnu/qfs,quantcast/qfs,quantcast/qfs,thebigbrain/qfs,qnu/qfs,fengshao0907/qfs,qnu/qfs,qnu/qfs