Check if /root is owned by an RPM package

This test assumes that certain paths are owned by RPM
packages, but this isn't the case on Ubuntu.

Author: jan-cerny

tests/probes/rpm/rpmverify/test_probes_rpmverify_not_equals_operation.sh

@@ -7,6 +7,8 @@ set -e -o pipefail
 
 function perform_test {
     probecheck "rpmverify" || return 255
+    require rpm || return 255
+    rpm -qf /root || return 255
 
     DF="$srcdir/test_probes_rpmverify_not_equals_operation.xml"
     RF="results.xml"