IcmpPing: Fix string typos in ping test modules

Signed-off-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Iperf: Fix typo in rate limit evaluation

There's a typo in rate evaluation. The rate_units should be used instead
of rate_val for the comparison.

Signed-off-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>