It's possible that the logging FIFO doesn't do a complete read (or the sender a
complete write) with the result that an incomplete message is read in bitbake.
This used to result in silently truncated lines but since 42d727 now also
results in a warning as the start of the rest of the message isn't a valid
logging command.
Solve this by storing incoming bytes in a bytearray() across reads, and parsing
complete messages from that.
[ YOCTO #9999 ]
(Bitbake rev: 508112793ee7ace613f07695222997309a2ca58f)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>