ignored_error.
(channel_io_read): If ignored_error is non-zero, tread read errors
with matching errno as EOF.
(channel_io_write, channel_io_flush): Fixed werror format string.

* src/channel_io.h (class channel_read_state): New attribute
ignored_error.

Rev: src/channel_io.c:1.1.2.7
Rev: src/channel_io.h:1.1.2.4