check df with -c so we get info from ocp 3.7+, avoid divide by 0
check df with -c so we get info from ocp 3.7+, avoid divide by 0

twiest/openshift-tools,joelddiaz/openshift-tools,drewandersonnz/openshift-tools,openshift/openshift-tools,ivanhorvath/openshift-tools,joelddiaz/openshift-tools,ivanhorvath/openshift-tools,joelddiaz/openshift-tools,drewandersonnz/openshift-tools,twiest/openshift-tools,twiest/openshift-tools,twiest/openshift-tools,openshift/openshift-tools,drewandersonnz/openshift-tools,drewandersonnz/openshift-tools,joelddiaz/openshift-tools,twiest/openshift-tools,twiest/openshift-tools,joelddiaz/openshift-tools,openshift/openshift-tools,blrm/openshift-tools,blrm/openshift-tools,openshift/openshift-tools,openshift/openshift-tools,joelddiaz/openshift-tools,drewandersonnz/openshift-tools,ivanhorvath/openshift-tools,blrm/openshift-tools,openshift/openshift-tools,blrm/openshift-tools,ivanhorvath/openshift-tools,blrm/openshift-tools,blrm/openshift-tools,ivanhorvath/openshift-tools,drewandersonnz/openshift-tools,ivanhorvath/openshift-tools