fix(smp value): SMP value shouldn't exceed CPUs amount in cpuset.conf
fix(smp value): SMP value shouldn't exceed CPUs amount in cpuset.conf

When big instance (with 16 CPUs) is used in the test SMP value is calculated wrong.
The test fails if SMP exceeds CPU amount that defined in cpuset - '1-7,9-15',
it means 14. So SMP can't be higher then 14

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests