修复weixin-java-mp发送文件上传请求时Content-Type没有boundary的问题 #3282
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MaterialUploadApacheHttpRequestExecutor手动设置的Content-Type请求头没有boundary，是一个非标准的文件上传请求头，虽然微信提供了对这类非标准请求的支持，但如果请求需要先经过我们的tomcat server，那么都会报错:the request was rejected because no multipart boundary was found。不设置Content-Type请求头，httpclient将会自动设置，值为entity的getContentType方法返回值。MultipartFormEntity的getContentType方法将会返回boundary