Nick Craig-Wood a351484997 sftp: fix timeout on hashing large files by sending keepalives
Before this fix the SFTP sessions could timeout when doing hashes if
they took longer than the --timeout parameter.

This patch sends keepalive packets every minute while a shell command
is running to keep the connection open.

See: https://forum.rclone.org/t/rclone-check-over-sftp-failure-to-calculate-md5-hash-for-large-files/27487
2021-11-22 15:26:29 +00:00
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