yum: Fixed CentOS CR repo for CentOS 7.

yum/manifests/init.pp

@@ -393,8 +393,15 @@ class yum::repo::centos-cr {
         fail("CentOS CR repository not supported in ${::operatingsystem}")
     }
 
-    package { "centos-release-cr":
-        ensure => installed,
+    if versioncmp($::operatingsystemrelease, "7") < 0 {
+        package { "centos-release-cr":
+            ensure => installed,
+        }
+    } else {
+        augeas { "enable-centos-cr-repo":
+            context => "/files/etc/yum.repos.d/CentOS-CR.repo/cr",
+            changes => "set enabled 1",
+        }
     }
 
 }