Make release infomation work with recent yum
    
    Bug 1040607 describes the issue. Though just removing the version
    redhat-release would have fixed the bug, I still added a provides
    for system-release(release) since the default (in yum) is now to check that
    first. And I removed the version from system-release in case someone
    sets their yum config to check that instead of the default.