[Automation] RunbookDraftClient.ReplaceContentPreparer sending content as JSON

[hbuckle]

Bug Report

• import path of package in question - .../services/automation/mgmt/2015-10-31/automation
• SDK version - 19.1.0
• output of go version - go1.10.2 windows/amd64

When updating a runbook draft with ReplaceContent the body is being sent as JSON, so line breaks and double quotes are not correctly passed:

PUT https://management.azure.com/subscriptions/xxx/resourceGroups/testytest/providers/Microsoft.Automation/automationAccounts/testytest/runbooks/testy/draft/content?api-version=2015-10-31 HTTP/1.1
Host: management.azure.com
Content-Length: 95
Authorization: Bearer xxx
Content-Type: text/powershell
Accept-Encoding: gzip

"# Comment\r\nWrite-Output \"testing\"\r\nWrite-Output \"more testing\""

Changing autorest.WithJSON to autorest.WithString resolves the issue:

PUT https://management.azure.com/subscriptions/xxx/resourceGroups/testytest/providers/Microsoft.Automation/automationAccounts/testytest/runbooks/testy/draft/content?api-version=2015-10-31 HTTP/1.1
Host: management.azure.com
Content-Length: 85
Authorization: Bearer xxx
Content-Type: text/powershell
Accept-Encoding: gzip

# Comment
Write-Output "testing"
Write-Output "more testing"

[jhendrixMSFT]

This was fixed in the swagger unfortunately it didn't get merged in time for the v19 release. The fix is already checked into the latest branch and will get rolled out in v20 since it's a breaking change.

[jhendrixMSFT]

Fixed in https://github.com/Azure/azure-sdk-for-go/releases/tag/v20.0.0