SL6 is recognized as redhat instead of its own distro

[aaronjensen]

New issue, as instructed in #2673. Let me know if you need anything else. Thanks!

$ ls -l  /etc/*{version,release}*
ls: cannot access /etc/*version*: No such file or directory
-rw-r--r-- 1 root root   38 Jul 26  2012 /etc/redhat-release
lrwxrwxrwx 1 root root   14 Dec  5  2012 /etc/system-release -> redhat-release
-rw-r--r-- 1 root root   38 Jul 26  2012 /etc/system-release-cpe

/etc/lsb-release.d:
total 0
-rw-r--r-- 1 root root 0 May 20  2011 core-4.0-amd64
-rw-r--r-- 1 root root 0 May 20  2011 core-4.0-noarch
-rw-r--r-- 1 root root 0 May 20  2011 graphics-4.0-amd64
-rw-r--r-- 1 root root 0 May 20  2011 graphics-4.0-noarch
-rw-r--r-- 1 root root 0 May 20  2011 printing-4.0-amd64
-rw-r--r-- 1 root root 0 May 20  2011 printing-4.0-noarch

$ head -n 100 /etc/*{version,release}*
head: cannot open `/etc/*version*' for reading: No such file or directory
==> /etc/lsb-release.d <==
head: error reading `/etc/lsb-release.d': Is a directory

==> /etc/redhat-release <==
Scientific Linux release 6.3 (Carbon)

==> /etc/system-release <==
Scientific Linux release 6.3 (Carbon)

==> /etc/system-release-cpe <==
cpe:/o:redhat:enterprise_linux:6.3:ga