resource/function_app: Add support for outputting site_credentials

[stack72]

Fixes: #1328

Modelled on that of app_service

▶ acctests azurerm TestAccAzureRMFunctionApp_
=== RUN   TestAccAzureRMFunctionApp_importBasic
--- PASS: TestAccAzureRMFunctionApp_importBasic (121.08s)
=== RUN   TestAccAzureRMFunctionApp_importTags
--- PASS: TestAccAzureRMFunctionApp_importTags (118.88s)
=== RUN   TestAccAzureRMFunctionApp_importAppSettings
--- PASS: TestAccAzureRMFunctionApp_importAppSettings (140.97s)
=== RUN   TestAccAzureRMFunctionApp_basic
--- PASS: TestAccAzureRMFunctionApp_basic (149.64s)
=== RUN   TestAccAzureRMFunctionApp_tags
--- PASS: TestAccAzureRMFunctionApp_tags (135.59s)
=== RUN   TestAccAzureRMFunctionApp_tagsUpdate
--- PASS: TestAccAzureRMFunctionApp_tagsUpdate (188.66s)
=== RUN   TestAccAzureRMFunctionApp_appSettings
--- PASS: TestAccAzureRMFunctionApp_appSettings (276.09s)
=== RUN   TestAccAzureRMFunctionApp_siteConfig
--- PASS: TestAccAzureRMFunctionApp_siteConfig (129.07s)
=== RUN   TestAccAzureRMFunctionApp_connectionStrings
--- PASS: TestAccAzureRMFunctionApp_connectionStrings (154.03s)
=== RUN   TestAccAzureRMFunctionApp_siteConfigMulti
--- PASS: TestAccAzureRMFunctionApp_siteConfigMulti (321.31s)
=== RUN   TestAccAzureRMFunctionApp_updateVersion
--- PASS: TestAccAzureRMFunctionApp_updateVersion (217.87s)
=== RUN   TestAccAzureRMFunctionApp_3264bit
--- PASS: TestAccAzureRMFunctionApp_3264bit (176.06s)
=== RUN   TestAccAzureRMFunctionApp_httpsOnly
--- PASS: TestAccAzureRMFunctionApp_httpsOnly (149.35s)
=== RUN   TestAccAzureRMFunctionApp_consumptionPlan
--- PASS: TestAccAzureRMFunctionApp_consumptionPlan (146.26s)
=== RUN   TestAccAzureRMFunctionApp_createIdentity
--- PASS: TestAccAzureRMFunctionApp_createIdentity (126.58s)
=== RUN   TestAccAzureRMFunctionApp_updateIdentity
--- PASS: TestAccAzureRMFunctionApp_updateIdentity (129.65s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	2681.121s

[tombuildsstuff]

LGTM - thanks for this 👍🏼

[tombuildsstuff]

hi @stack72

Just to let you know that is now available in [v1.10 of the AzureRM Provider(https://github.com/terraform-providers/terraform-provider-azurerm/blob/v1.10.0/CHANGELOG.md#1100-july-21-2018) - which you can update to this version by specifying it in the Provider block, like so:

provider "azurerm" {
  version = "=1.10.0"
}

Thanks!

[arichiardi]

Thanks a lot!

[ghost]

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