Thrift: Adding StatsProcessor, PeekProcessor, TPipedFileReaderTransport, and TPipedFi...

Thrift: Adding StatsProcessor, PeekProcessor, TPipedFileReaderTransport, and TPipedFileReaderTransportFactory classes
- StatsProcessor can be used to print events, or keep track of event frequency
- PeekProcessor is used to examine data in a thrift event, prior to passing it along to an underlying processor
- TPipedFileReaderTransport and its factory are used to pipe a TFileReaderTransport (which TFileProcessor requires)

Also fixed some bugs in TFileTransport - next flush time was overflowing and not always being reset

Reviewed by: aditya, mcslee

Test Plan: Tested using various thrift clients (scribe, falcon) and gdb in sandbox and on dev008.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665066 13f79535-47bb-0310-9956-ffa450edef68