Add copyright for missing files

* added license templates for go, bash & yaml in tools dir
* added a script that will add license information for all
    missing files. Type:  go, yaml, yml, sh
* skip adding license for all files within testdata
* Syntax:
   > ./tools/add_license.sh

* Skip license for manifests folder
* Added one extra line after licene for yaml files
* Added License after Hashbang for bash.
* Add an extra line after hashbang and before license
* Updated the go template to use multiline comments

New Files:
  1. tools/add_license.sh
  2. tools/license_go.txt
  3. tools/license_yaml.txt
  4. tools/license_bash.txt

Change-Id: Ia4da5b261e7cd518d446896b72c810421877472a
Realtes-To:#147

cmd/config/config.go

@@ -1,3 +1,17 @@
+/*
+ Licensed 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
+
+     https://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.
+*/
+
 package config
 
 import (