Description of problem: libxml2-python is necessary for up2date to work. Yet it is not in the requires list Version-Release number of selected component (if applicable): up2date-4.3.17-1
Nothing in up2date requires libxml2-python directly, so its probabaly a dep missing on some other package. What are you seeing that requires libxml2-python? maybe a rhnlib issue
next release should include this dep