[Users] Node register bug work around

[Andrew Dunlop]

I realise there is a bug open for a problem where nodes can't register
with engine (https://bugzilla.redhat.com/show_bug.cgi?id=782663).
However is there any way to easily work around this problem for now.
If I add it from the UI it will try to install the node rather than
just registering a pre installed from iso node. Is there anyway of
registering it from the management machine without it trying to
install?
I realise the answer might be to hold on for the fix to be commited
but if there is an easy way then that would be good.