re-enable pernode test
Merge remote-tracking branch 'origin/master'
Fix a deadlock in _papi_hwi_lookup_cpu().

If cpu_num is not found by _papi_hwi_lookup_cpu(),
_papi_hwi_initialize_cpu() calls insert_cpu(), which locks CPUS_LOCK,
which was already held by _papi_hwi_lookup_cpu().