rhn-5.0.2, rhn-content-mgmt-0.2.9

When running rhn-manage-channel with a csv file, and not specifying --commit,
you will see spurious errors if:
 The channel families do not exist, even though you specified --create-family
 A channel in your csv is a child channel of another channel in your csv

These happen because each channel creation, and each channel family creation, is
a distinct XMLRPC call that gets rolled back at the end.

Instead, the entire operation should be a single call, so it can be rolled back
or committed together.