I didn't have such a thing on the RHEL7 beta VM I set up, nor on the RHEL7 RC I just set up. /etc/yum.repos.d was empty on both machines after installation, and "yum repolist all" reports "repolist: 0".
Perhaps it only appears if you attach a RHN subscription to the machine?
Snip...
(If you're wondering why I took the time to write all this up, it's because I figured it out back in December when the beta came out, then forgot a bunch of details in the ~4 months it took for the RC to come out and had to rediscover a bunch of it. If nothing else, this way I'll have a reference I can dig out of my email Sent folder the next time I need to do this.)
+1 Nice write up thanks for documenting this!