EX-4058 lamigo: don't generate useless noise

EX-4058 lamigo: don't generate useless noise

stop to generate useless debugging messages with non-changing
statfs data and hot/cold periods.

Test-Parameters: trivial testlist=hot-pools
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I3e601e3395b1f49a9e6bd8ae94fc7da9987a02a3
Reviewed-on: https://review.whamcloud.com/45241
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/46098