EX-4141 lipe: lamigo should detect dead OST and restart ALR

EX-4141 lipe: lamigo should detect dead OST and restart ALR

Use #keepalive message and ssh read with timeout
to detect OST is down and restart ALR.
Add stats for ALR last seen message
Duplicate ofd_access_log_reader from lustre/utils into
lipe/src/es_ofd_access_log_reader
Use common lamigo_hash.h for lamigo and
es_ofd_access_log_reader

Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Test-Parameters: trivial testlist=hot-pools
Change-Id: I26dc631a8663046821e049fc6e091108b2a62f87
Reviewed-on: https://review.whamcloud.com/46944
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John Hammond <jhammond@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>