the rpmmd repository type is not finished for up2date.  This is the *new* format
that is used by yum (and on the fedora core CD). 

When entering a line of

rpmmd myrepo http://url.to.repo/

up2date fails with a stack trace noting that the parseRpmmd function is not
defined (which is isn't defined in sourcesConfig.py but is called).

From what I've figured that function needs to be created and code in
rhnChannel.py needs to be added to handle that backend as well as the code in
repoBackends/rpmmdRepo.py needing to be finished.