Fixes #6808/BZ1124058: fixing permissions of product buttons.

Several product buttons were using the incorrect permission
in determining whether to disable the buttons.  This commit
fixes these incorrect permissions.

http://projects.theforeman.org/issues/6808
https://bugzilla.redhat.com/show_bug.cgi?id=1124058
I agree with this change... although I wonder if the attribute simply being something like `redhat_product` or `redhat` might be more informative at this point?