producer python api for send_file ready

common/cpp/include/common/networking.h

producer/api/cpp/include/producer/producer_error.h

producer/api/cpp/src/producer_impl.cpp

producer/api/cpp/src/producer_request.cpp

producer/api/cpp/src/producer_request.h

producer/api/cpp/src/request_handler_tcp.cpp

producer/api/cpp/unittests/test_producer.cpp

producer/api/cpp/unittests/test_producer_impl.cpp

...cer/api/cpp/unittests/test_request_handler_filesystem.cpp

producer/api/cpp/unittests/test_request_handler_tcp.cpp

producer/api/python/CMakeLists_Linux.cmake

producer/api/python/asapo_producer.pxd

producer/api/python/asapo_producer.pyx.in

producer/api/python/asapo_wrappers.h

tests/manual/python_tests/producer/authorizer.json.tpl

tests/manual/python_tests/producer/authorizer.nmd

tests/manual/python_tests/producer/clean_db.sh

tests/manual/python_tests/producer/discovery.json.tpl

tests/manual/python_tests/producer/discovery.nmd

tests/manual/python_tests/producer/file1