updated for proper image compression

library/centos

@@ -2,4 +2,4 @@
 
 latest: git://github.com/CentOS/sig-cloud-instance-images@dbcffd71d9e7ddc3168df7653f9d83323ba43a05 docker
 centos7: git://github.com/CentOS/sig-cloud-instance-images@dbcffd71d9e7ddc3168df7653f9d83323ba43a05 docker
-centos6: git://github.com/CentOS/sig-cloud-instance-images@82106a234fafd2d55c946a1447da193927c8677d docker
+centos6: git://github.com/CentOS/sig-cloud-instance-images@c5a1d99681cf08990e9873c0a8880d0f61a43a48 docker