sstable_resharding_test: fix sstable_resharding_strategy_tests with odd smp count
sstable_resharding_test: fix sstable_resharding_strategy_tests with odd smp count

leveled_compaction_strategy_strategy::get_resharding_jobs() returns compaction
jobs, each containing at most smp::count ssts, so calculation is wrong if
smp count is an odd number.

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>
Acked-by: Benny Halevy <23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>
Message-Id: <20200305161003.14424-1-1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@scylladb.com>

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