packaging: add license to missing cloud.limits

I think Hugo/Daan forgot to add license header on one of the new centos7
packaging :)

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

packaging/centos7/cloud.limits

@@ -1,2 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
 cloud hard nofile 4096
 cloud soft nofile 4096