Qfs kerberos lib: make credentials cache initialization from key tab lazy in order to reduce kdc load due to possible simultaneous start of [chunk] servers: only re-initialize cache when credentials are about to expire, or not available.
Qfs kerberos lib: make credentials cache initialization from key tab lazy in order to reduce kdc load due to possible simultaneous start of [chunk] servers: only re-initialize cache when credentials are about to expire, or not available.

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