utils: logalloc: reclaim_timer: report non-decreasing durations
utils: logalloc: reclaim_timer: report non-decreasing durations

The hope is that this reduces logspam without losing utility.

Signed-off-by: Michael Livshin <ae60993c65de9cdf2ca07b7426c976808535d555@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla