cardiff: Adding minimum variance check
cardiff: Adding minimum variance check

We shall not try to find the black sheep if the variance is below a
certain value. This patch add a tolerance_min inside the print_perf() to
avoid useless warnings.

redhat-cip/edeploy,enovance/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,lebauce/edeploy,redhat-cip/edeploy,lebauce/edeploy,enovance/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy,lebauce/edeploy