moved around logging into sensible places

psrdada_cpp/dada_client_base.hpp

psrdada_cpp/detail/dada_io_loop_reader.cpp

psrdada_cpp/detail/dada_io_loop_writer.cpp

psrdada_cpp/examples/dbnull.cpp

psrdada_cpp/src/cli_utils.cpp

psrdada_cpp/src/dada_client_base.cpp

psrdada_cpp/src/dada_io_loop.cpp

psrdada_cpp/src/dada_read_client.cpp

psrdada_cpp/src/dada_write_client.cpp