Added system wrapper for IO

common/cpp/CMakeLists.txt

common/cpp/include/common/networking.h

common/cpp/include/common/os.h

common/cpp/include/system_wrappers/io.h

common/cpp/include/system_wrappers/system_io.h

common/cpp/src/system_io.cpp

common/cpp/unittests/test_common.cpp

producer/api/include/producer/producer.h

producer/api/src/producer/producer.cpp

producer/api/unittests/test_producer.cpp

producer/inotify-event-detector-cpp/src/main.cpp

...tify-event-detector-cpp/unittests/test_inotify_client.cpp