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Fix onie discover stopped while console XOFF is triggered #386

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Fix onie discover stopped while console XOFF is triggered #386

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Commits on Jun 23, 2016

  1. Fix onie discover stopped while console XOFF is triggered 

    This patch print logs to files, which was printed to /dev/console directly
    - tee_log_file to /var/log/onie-tee.log
    - _log_console_msg to /var/log/onie-console.log
    - /etc/rcS.d/S30console-logger.sh will tail these logs to /dev/console

Cause:
    While XOFF is trigger with console port somehow, onie discover will stop
searching installer after a while.

Reproduce:
    1. In console terminal, type CTRL+S to send XOFF
    2. telnet/ssh to DUT, and tail -f /var/log/onie.log
    3. The discover loop will stop searching after a while,
       since linux kernel console buffer is full.
    @audihsu-qci
    audihsu-qci committed Jun 23, 2016
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