add INFO level operation logging on each node.

Administrator couldn't track operation on each node without this function.
This function logs only administrative operation at rx_main and tx_main.
Operations that is not related to administrative operation are not
logged in this function. such as read/write etc.

Signed-off-by: Yoshinori Matsuo <matsuo.yoshinori@lab.ntt.co.jp>
Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
sheep: changed end of auto-recovery message to notice

Sheep output the end of auto-recovery log message (all nodes are recovered)
at DEBUG level.
When sheep nodes are working in the INFO level or upper,
the operator could not get this message
even if operators want to know the completion of auto-recovery.

This patch raised the log message to the NOTICE level.

Signed-off-by: Yoshinori Matsuo <matsuo.yoshinori@lab.ntt.co.jp>
Reviewed-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>

Conflicts:
	sheep/ops.c

Conflicts were resolved by Hitoshi Mitake.
Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>