netperf: adjust fbase to 5

We do rounding in regression.py, so here we adjust the default
fbase to 5

Signed-off-by: Amos Kong <akong@redhat.com>
netperf: kill netperf clients after effective test finishes

Currently we still wait client thread to stop after effective test
finishes, it wastes of time. This patch directly killes the threads,
then client_thread.join() will return immediately.

Suggested-by: Wenli Quan <wquan@redhat.com>
Signed-off-by: Amos Kong <akong@redhat.com>
netperf: ignore error in environment setup

Signed-off-by: Amos Kong <akong@redhat.com>
Merge pull request #55 from kongove/netperf-improvement

simple patchset to improve netperf testcase