Remove Apache license from API client generators (#4197)

* remove php apache license

* remove apache license from C#

* remove apache license in objc code

* remove license from swift 3 code

* remove apache license from perl code

* remove license from scala code

* remove license from ts, go, android, cpp, scala

* remove license from java api client

* restore clojure petstore files

* remove license from travis file

* clean up apache-related terms in php, ruby, python mustache tempaltes

* remove license from JS API cilent

modules/swagger-codegen/src/main/resources/csharp/TestProject.mustache

@@ -10,19 +10,6 @@
 {{/appDescription}}
 {{#version}}OpenAPI spec version: {{{version}}}{{/version}}
 {{#infoEmail}}Contact: {{{infoEmail}}}{{/infoEmail}}
-Generated by: https://github.com/swagger-api/swagger-codegen.git
-
-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
-
-     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.
 -->
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>