Typo in error message

[weltonrodrigo]

Describe the bug
There is a typo in an error message:

E1220 12:16:22.587762       1 controller.go:142] network.ApplicationGatewaysClient#CreateOrUpdate: Failure sending request: 
StatusCode=400 -- Original Error: Code="ApplicationGatewayBackendAddressPoolInUseByVirtualMachineScaleSet" 
Message="Cannot remove backend address pool XXXXXXXX from applciation gateway /subscriptions/XXXXXXXXXXX/resourceGroups/XXXXXX/providers/Microsoft.Network/applicationGateways/XXXXXXXXXX 
because it is in use by virtual machine scale set /subscriptions/XXXXXXXXXXX/resourceGroups/XXXXXXXX/providers/Microsoft.Compute/virtualMachineScaleSets/XXXXXXXXXXXXX." Details=[]
E1220 12:16:22.587774       1 worker.go:62] Error processing event.network.ApplicationGatewaysClient#CreateOrUpdate: Failure sending request: StatusCode=400 --

Note the applciation gateway in third line.

To Reproduce

The situation per-si that caused the error it's irrelevant, here, but someone added manually a backend pool to a vm scaleset and then when the ingress-controller tried to update the application gateway, the backend could not be removed (the scaleset is running).

This seems to be the response coming from an azure API, not the ingress controller itself (I couldn't find this string anywhere in this code), but I suppose you can open the ticket internally.

[JackStromberg]

This is an error message returned back by Application Gateway. I've logged this is a bug to be fixed outside of the context of AGIC.