virt, DPDK Checkup: Warn about traffic-gen's high privileges

The traffic generator pod used by the DPDK checkup requires high
privileges.

Add a warning to the users.

Signed-off-by: Orel Misan <[email protected]>

Author: orelmisan

modules/virt-checking-cluster-dpdk-readiness.adoc

@@ -23,6 +23,16 @@ You run a DPDK checkup by performing the following steps:
 * You have installed the OpenShift CLI (`oc`).
 * You have configured the compute nodes to run DPDK applications on VMs with zero packet loss.
 
+[IMPORTANT]
+====
+The traffic generator pod created by the checkup has elevated privileges:
+
+* It runs as root.
+* It has a bind mount to the node's file system.
+
+The container image of the traffic generator is pulled from the upstream Project Quay container registry.
+====
+
 .Procedure
 
 . Create a `ServiceAccount`, `Role`, and `RoleBinding` manifest for the DPDK checkup and the traffic generator pod: