Thrift: Python TBufferedTransport improvements.

Thrift: Python TBufferedTransport improvements.

Summary:
The Python version of TBufferedTransport now uses input buffering.
It is also compatible with the fasbinary module.

Reviewed By: mcslee

Test Plan:
test/FastbinaryTest.py

dreiss@dreiss-vmware:~/gp/thrift/test/py$ strace -f ./TestClient.py 2>&1 | grep recv | wc -l
99
# Install new version in other terminal
dreiss@dreiss-vmware:~/gp/thrift/test/py$ strace -f ./TestClient.py 2>&1 | grep recv | wc -l
14

Revert Plan: ok

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665250 13f79535-47bb-0310-9956-ffa450edef68