generic.tests.cfg: Update netperf_stress related configure in kdump case.

Signed-off-by: Feng Yang <fyang@redhat.com>
qemu.tests.cfg.suspend_under_netperf: Remove netperf_stress variants

Only netperf_stress under this variants, so we can remove it to short
case name.

Signed-off-by: Feng Yang <fyang@redhat.com>
generic.tests.cfg: Update multi_queues_test's configure to use netperf_stress

Signed-off-by: Feng Yang <fyang@redhat.com>
Merge pull request #175 from FengYang/netperf_stress

Netperf stress related update