EX-5099 lipe: Made controllable ssh exec timeout

EX-5099 lipe: Made controllable ssh exec timeout

- Introduce new lipe ssh API:lipe_ssh_exec_timeout() and
lipe_ssh_start_cmd_timeout().
- Introduce new lamigo command option: --ssh-exec-timeout
to configure ssh connection timeout for ssh exec cmd
- Use lipe_ssh_start_cmd_timeout() to start remote
access log reader with timeout.
Use ssh_channel_read_timeout() with infinite timeout
when reads access log records
- Use lipe_ssh_start_cmd_timeout() to start remote "lfs ..."
commands with a long timeout to prevent premature timeout
when "lfs mirror extend ..." command for a big file
takes too long time.
- Use default timeout 600 seconds for ssh exec cmd.
Such long timeout should allow to finish long lasting
replications
This fixes EX-5429.

Test-Parameters: trivial clientdistro=el8.5 serverdistro=el8.5 testlist=hot-pools env=FAIL_ON_ERROR=false,ONLY="56 59",ONLY_REPEAT=20
Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Change-Id: I8de9b1db2014abd1e6f201cda73a0812128f6bb6
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/47057
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>