Qfs tools: implement and use stdin and stdout io with read and write system calls bypassing c++ istream and ostream in order to minimize cpu on the systems with in-efficient io stream implementation (for example it looks like that mac os maverick doesn't implement xputn() with streambuf used with cout).
Kfsio library: add minKeyValidTimeSec parameter to crypto keys parameter settings to allow to specify min. crypto key lifetime.
Meta server: set chunkServer.cryptoKeys.minKeyValidTimeSec with the value of chunk server access max valid time parameter, prior to issuing set parameters rpc to chunk servers in order to guarantee minimum key / access validity time.
Test scripts: turn on crypto keys persistence, disable hierarchical placement with append, use authentication set by env. variable with sort master test, use delegation token with sort master test.