Rename src/include files and folder

include/linkahead/logging.h

include/linkahead/message_code.h

include/linkahead/protobuf_helper.h

include/linkahead/result_set.h

include/linkahead/result_table.h

include/linkahead/status_code.h

include/linkahead/transaction.h

include/linkahead/transaction_handler.h

include/linkahead/transaction_status.h

include/linkahead/unary_rpc_handler.h

include/linkahead/utility.h

include/linkahead/value.h

src/clinkahead.cpp

src/clinkaheadcli.c

src/cxxlinkaheadcli.cpp

src/linkahead/acm/user.cpp

src/linkahead/acm/user_impl.h

src/linkahead/authentication.cpp

src/linkahead/configuration.cpp

src/linkahead/connection.cpp