netperf: fix command to check KVM version
'rpm -qa |grep kvm' might return multiple packages
[amos@amosk logs]$ rpm -qa |grep kvm
qemu-kvm-1.6.1-3.fc20.x86_64
libvirt-daemon-kvm-1.1.3.3-2.fc20.x86_64
[amos@amosk logs]$ rpm -q qemu-kvm
qemu-kvm-1.6.1-3.fc20.x86_64
Signed-off-by: NAmos Kong <akong@redhat.com>
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