[BUG][GO][CLIENT] Compilation failure when multiple multi params

Created by: qmuntal

Version 4.1.1

Command line used for generation openapi-generator generate -i swagger.yaml -g go-o ./

Spec

swagger: "2.0"
info: 
  title: Foo
  version: v1
paths: 
  /foo: 
    post:
      operationId: fooPost
      parameters: 
       - 
        name: user_ids[]
        in: query
        required: false
        type: array
        items:
          type: string
        collectionFormat: multi
       - 
        name: user_names[]
        in: query
        required: false
        type: array
        items:
          type: string
        collectionFormat: multi
      responses: 
        200: 
          description: "successful operation"

Description The Go client code generation is adding duplicated reflect imports for each parameter of type array multi. The above spec produces the following import:

import (
	_context "context"
	_ioutil "io/ioutil"
	_nethttp "net/http"
	_neturl "net/url"
	"reflect"
	"github.com/antihax/optional"
	"reflect"
)

This bug was introduced in the PR #3390 (source code)