This fixes a problem when using the framework helper
e2epod.CreateExecPodOrFail() more than once in the same test.
The problem is that this function was creating pods with both the
pod.Name and pod.GenerateName set.
The second pod failed to be created with a 500 with Reason ServerTimeout
indicating a unique name could not be found in the time allotted,
xref https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.19/