Adding dag-EL7.repo file

NEWS

+release/004.053 (2015-07-28)
+
+    [rpm] Adding a dag-EL7.repo file so that EL7 hosts can get a
+    valid repo file based on the existing logic of the manifest (jlent)
+
 release/004.052 (2015-07-27b)
 
     [iptables] Add an "include base::iptables" to base::iptables::rule

files/rpm/dag-EL7.repo

+# Name: Dag EL7 repo
+# URL: http://yum.stanford.edu/
+[dag]
+name = Dag packages $releasever
+baseurl = http://yum.stanford.edu/mrepo/dag-EL7-$basearch/RPMS.updates
+enabled = 1
+protect = 0
+gpgkey = http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt
+gpgcheck = 1
+