fixed io/ioutil import issue, fixed param casing issue

modules/swagger-codegen/src/main/resources/go/api.mustache

@@ -6,6 +6,15 @@ import (
     "fmt"
     "encoding/json"
     "errors"
+    {{#operation}}
+    {{#hasFormParams}}
+    {{#formParams}}
+    {{#isFile}}
+    "io/ioutil"
+    {{/isFile}}
+    {{/formParams}}
+    {{/hasFormParams}}
+    {{/operation}}
 {{#imports}}    "{{import}}"
 {{/imports}}
 )
@@ -90,7 +99,7 @@ func (a {{classname}}) {{nickname}} ({{#allParams}}{{paramName}} {{{dataType}}}{
   
   {{#hasQueryParams}}    
   {{#queryParams}}
-  queryParams["{{vendorExtensions.x-exportParamName}}"] = a.Configuration.ApiClient.ParameterToString({{paramName}})
+  queryParams["{{paramName}}"] = a.Configuration.ApiClient.ParameterToString({{paramName}})
   {{/queryParams}}
   {{/hasQueryParams}}
 
@@ -124,7 +133,7 @@ func (a {{classname}}) {{nickname}} ({{#allParams}}{{paramName}} {{{dataType}}}{
   {{#isFile}}fileBytes, _ := ioutil.ReadAll(file)
   postBody = fileBytes
   {{/isFile}}
-{{^isFile}}formParams["{{vendorExtensions.x-exportParamName}}"] = {{paramName}}
+{{^isFile}}formParams["{{paramName}}"] = {{paramName}}
   {{/isFile}}
 {{/formParams}}
 {{/hasFormParams}}{{#hasBodyParam}}{{#bodyParams}}  // body params

samples/client/petstore/go/go-petstore/pet_api.go

@@ -5,8 +5,8 @@ import (
     "fmt"
     "encoding/json"
     "errors"
-    "os"
     "io/ioutil"
+    "os"
 )
 
 type PetApi struct {
@@ -201,7 +201,7 @@ func (a PetApi) FindPetsByStatus (status []string) ([]Pet, error, ApiResponse) {
       headerParams[key] = a.Configuration.DefaultHeader[key]
   }
   
-  queryParams["Status"] = a.Configuration.ApiClient.ParameterToString(status)
+  queryParams["status"] = a.Configuration.ApiClient.ParameterToString(status)
 
   // to determine the Content-Type header
   localVarHttpContentTypes := []string {
@@ -269,7 +269,7 @@ func (a PetApi) FindPetsByTags (tags []string) ([]Pet, error, ApiResponse) {
       headerParams[key] = a.Configuration.DefaultHeader[key]
   }
   
-  queryParams["Tags"] = a.Configuration.ApiClient.ParameterToString(tags)
+  queryParams["tags"] = a.Configuration.ApiClient.ParameterToString(tags)
 
   // to determine the Content-Type header
   localVarHttpContentTypes := []string {
@@ -497,8 +497,8 @@ func (a PetApi) UpdatePetWithForm (petId int64, name string, status string) (err
       headerParams["Accept"] = localVarHttpHeaderAccept
   }
 
-  formParams["Name"] = name
-  formParams["Status"] = status
+  formParams["name"] = name
+  formParams["status"] = status
 
 
   httpResponse, err := a.Configuration.ApiClient.CallApi(path, httpMethod, postBody, headerParams, queryParams, formParams)
@@ -567,7 +567,7 @@ func (a PetApi) UploadFile (petId int64, additionalMetadata string, file *os.Fil
       headerParams["Accept"] = localVarHttpHeaderAccept
   }
 
-  formParams["AdditionalMetadata"] = additionalMetadata
+  formParams["additionalMetadata"] = additionalMetadata
   fileBytes, _ := ioutil.ReadAll(file)
   postBody = fileBytes
 

samples/client/petstore/go/go-petstore/user_api.go

@@ -365,8 +365,8 @@ func (a UserApi) LoginUser (username string, password string) (string, error, Ap
       headerParams[key] = a.Configuration.DefaultHeader[key]
   }
   
-  queryParams["Username"] = a.Configuration.ApiClient.ParameterToString(username)
-  queryParams["Password"] = a.Configuration.ApiClient.ParameterToString(password)
+  queryParams["username"] = a.Configuration.ApiClient.ParameterToString(username)
+  queryParams["password"] = a.Configuration.ApiClient.ParameterToString(password)
 
   // to determine the Content-Type header
   localVarHttpContentTypes := []string {